13 Best Aquarium Water Pumps

As I watched the water circulate in a fish tank of my dentist’s office, it got me thinking.

Do I need a water pump for my aquarium?

Is it necessary to have an aquarium water pump? What does it do?

So I decided to find out more.

If you have been facing the same queries, you have landed at the right place.

Water pumps are indeed valuable when it comes to optimal fish care.

And it is vital to find one with all the right features.

Let me tell you more.

Contents show

13 Best Aquarium Water Pumps

ProductFlow ratePower 
Simple Deluxe 400 GPH UL Listed Submersible Pump400 GPH54W
Homasy 80 GPH Submersible Water Pump80 GPH4W
Homasy Upgraded 80 GPH Submersible Water Pump80 GPH4W
KEDSUM 550GPH Submersible Pump550 GPH40W
VIVOSUN 400GPH Submersible Pump400 GPH15W

Why Do You Need An Aquarium Water Pump?

It is vital to keep the water of the aquarium clean so that the aquatic life can thrive.

Keep in mind, for the water to remain healthy, you need to ensure that the tank does not become stagnant.

Thus, it is essential that water continues to be circulated and filtered.

This is where the use of aquarium pumps proves to be pivotal.

These pumps move the water to the surface thereby ensuring that it is aerated.

The aeration leads to release of carbon dioxide from the tank while at the same time, the oxygen is absorbed.

The thing is;

Carbon dioxide tends to settle below the surface.

Therefore, it needs to be stirred so that it rises to the surface and is removed from the tank.

Furthermore, tanks also circulate the water, preventing stagnation.

Aquarium Water Pumps Detailed Product Reviews

1.  Simple Deluxe 400 GPH UL Listed Submersible Pump



 Key Facts
  • Brand: Simple Deluxe
  • Weight: 2.1 pounds
  • Flow rate: 400 GPH
  • Maximum lift height: 8.2ft
  • Power: 54W
  • Cord Length: 15 ft.
  • Dimensions: 5.35 x 2.72 x 3.39 in
  • Includes a pre-filter
  • Provided with three nozzles of 0.51in, 0.62in and 0.75in

This reliable aquarium water pump ensures that your aquatic life gets a favorable environment to thrive in by circulating and aerating the water.

For one thing, it is highly durable as it is provided with aluminum oxide ceramic impeller shaft and epoxy resin encasement.

There’s more;

The safety of your fish will not be compromised since they would not be exposed to copper.


  • Easy to clean since it comes with a pre-filter and does not require tools for detaching.
  • It is equipped with polish aluminum oxide ceramic impeller shaft which increases the longevity of the pump significantly owing to its non-corrodible property.
  • The internal components of the motor are also protected from corrosion owing to epoxy resin encasement making it safe for fish since they are not exposed to copper.


  • The instructions do not state how the filter is to be used making it difficult for the beginners to use the unit.

2. Homasy 80 GPH Submersible Water Pump



 Key Facts
  • Brand: Homasy
  • Weight: 6.4 ounces
  • Flow rate: 80 GPH
  • Power: 4W
  • Cord length: 5.9 ft.
  • Maximum lift height: 2.6 ft.
  • Dimensions: 1.87in x 1.68in x 1.24in
  • Provided with two nozzles, 8.5mm and 13mm of diameter

The submersible water pump by Homasy is suitable for aquariums, small to medium in size, water gardens and tabletop fountains owing to its multi-functionality.

Two nozzles are provided with it to ensure that the unit can be used with various tubing sizes.

The flow rate is adjustable via a knob.


  • Compact design which makes disguising it in water easy ensuring that the beauty of your tank is not compromised
  • Easy cleaning and maintenance since you can easily detach the pump, without having to use any tools for the purpose.
  • It continues to operate quietly without causing any distractions.


  • Once you unplug it, it tends to be a little challenging to restart it.
  • If the pump is placed on the side of the aquarium, the tubing has to be looped as otherwise, it points outwards.

3. Homasy Upgraded 80 GPH Submersible Water Pump



 Key Facts
  • Brand: Homasy
  • Weight: 4.9oz
  • Flow rate: 80 GPH
  • Power: 4W
  • Cord length: 5.9 ft.
  • Maximum lift height: 2.6ft
  • Dimensions: 3.4 x 3.1 x 2.2 inches
  • Color: black
  • Provided with two nozzles, 0.33 and 0.51in

Homasy endeavors to ensure that they offer the users with the best possible products and this upgraded water pump is no exception.

Its size and design make it suitable for fountains, hydroponic systems and tanks.

The best thing is;

You are offered one year warranty.

The pump does not disappoint even if the water quantity is low.


  • Provided with a dry burning capacity which allows the unit to run for a continuous 48 hours. Thus, if you need to go out for a couple of days, you will not have to worry about your fish
  • Quiet operation and therefore, you do not have to worry about the water pump disrupting the peace of the area it is placed in
  • Offers a warranty period of one year ensuring you do not have stress if something is amiss.


  • The unit tends to get clogged easily and thus requires maintenance every month.
  • Less power is used for pushing the water making the flow and current weak.

4.KEDSUM 550GPH Submersible Pump



 Key Facts
  • Brand: KEDSUM
  • Weight: 1.8 pounds
  • Flow rate: 550 GPH
  • Power: 40W
  • Cord length: 4.6 ft.
  • Maximum height lift: 5ft
  • Dimensions: 3.8 x 4.7 x 2.8 inches
  • Three outlet adapters included of 0.75inch, 0.87inch, and 0.51inch

You can use this pump for saltwater as well as freshwater tanks.

The unit is compact which makes it a preferable option for aquariums.

But wait, there is more;

Despite its size, the pump is quite powerful.

You will find it quite easy to detach and clean the pump, thus making maintenance easy.


  • Operates quietly and thus can easily be used if the tank is in your room.
  • Energy efficient and thus, you will not find your energy bills spinning out of control owing to it.
  • Easy to install, horizontally and vertically with the help of suction cups and you can place it on the sides of the aquarium or the walls of the pond with ease.


  • The inner shaft needs lubrication for proper functioning, making the pump unsuitable for sensitive fish.
  • Needs frequent maintenance

5. VIVOSUN 400GPH Submersible Pump



 Key Facts
  • Brand: VIVOSUN
  • Weight: 1.2 pounds
  • Flow rate: 400 GPH
  • Power: 15W
  • Maximum height lift: 5.3 ft.
  • Cord length: 5ft.
  • Voltage: 110-120V
  • Dimensions: 5.1 x 4.5 x 3.2 inches
  • Provided with two nozzles, 0.51inch and 0.62inch
  • Includes a detachable filter cover

The unit has been provided with quite a lot of appealing features and yet it is quite reasonably priced.

You can use the pump in both dry and wet installations.

Owing to the wet bearing technology that is part of the pump, it offers cool running.

Remember; it is to be used only for freshwater.


  • Compact and yet sturdy design making it a suitable option if you have limited space in your tank.
  • Provided with a pre-filter that prevents the entry of debris in the water ensuring that your fish get a clean environment to thrive and the filter does not require frequent cleaning
  • Can be installed horizontally and vertically easily with suction cups
  • The pump is versatile as well. Two nozzles form part of it, ensuring that you can adjust the water flow effects as per your requirements.
  • Quiet operation
  • It is energy efficient and thus do not put a strain on your budget with increased energy bills.


  • The tubing has to be purchased separately.

6. Simple Deluxe 80 GPH Submersible Pump



 Key Facts
  • Brand: Simple Deluxe
  • Weight: 4.8 ounces
  • Flow rate: 80 GPH
  • Power: 3.6W
  • Voltage: 120V
  • Cord length: 6ft.
  • Maximum lift height: 2.6 ft.
  • Dimensions: 1.97 x 1.73 x 1.26 in
  • Provided with four nozzles, two each of 0.31in and 0.51in

If you want an aquarium water pump which would be easy to install, use and maintain, this submersible water pump by Simple Deluxe is one that would not let you down.

The unit is equipped with two nozzles, 0.31 and 0.51 inches.

Therefore, you can get the water flow effects you like.


  • Easy to clean as you can easily disassemble it, without having to use tools for the same
  • The pump is highly durable and long-lasting as it maintains high standards of quality
  • Compact which ensures you can use it for your tanks with ease.
  • The water flow can easily be adjusted via a knob allowing you to set it according to your preference.
  • It is safe for the fish as there is no risk of oil spills and thus you can use it without stressing over any harmful effects
  • Does not produce a lot of noise
  • Offers warranty of one year.


  • Does not include a small hose clamp and thus there is no secure connection between the tubing and the adapter

7. Pedy 800GPH (3000L/H) Submersible Water Pump



 Key Facts
  • Brand: Pedy
  • Weight: 1.8lb
  • Flow rate: 800 GPH
  • Power: 24W
  • Voltage: 110V
  • Maximum lift height: 10ft.
  • Cord length: 4.4ft.
  • Dimensions: 4.1×3.5×2.6 inch
  • Three outlet adapters included 13, 15, and 18mm diameter

This submersible water pump by Pedy is indeed worthy of being counted among the best options available on the market.

For one thing, the speed flow is quite powerful.

There is more;

You can install it both vertically and horizontally.

You can use this water pump in both saltwater and freshwater.


  • Powerful and yet not very noisy ensuring that you can easily use the unit even if your tank is in your bedroom
  • The size and design of the unit ensure that you can disguise it in the tank easily.
  • Provided with three outlet adapters for versatility in water flow
  • Easy to clean as disassembly and detachment is not very difficult
  • Power consumption of the unit is low. Thus, your energy bills will remain within limits.


  • The inside plastic is somewhat brittle

8. Uniclife 80-550GPH Submersible Water Pump



 Key Facts
  • Brand: Uniclife
  • Weight: 6.4 ounces
  • Flow rate: 80 GPH
  • Power: 4W
  • Voltage: 120V
  • Max Lift: 30 inch
  • Cord length: 6ft.
  • Dimensions: 2.1 x 1.7 x 1.3 inches
  • Provided with two nozzles, 1/2″ and 1/3″

If you want versatility in the water pump you buy, this is the right option.

This water pump can be used both indoors and outdoors.

There is more;

The pump comes with three strong suction cups that make it shockproof.

You can use it safely in saltwater since there is no exposed metal and thus there is no risk of rusting.


  • Water flow is adjustable via a knob
  • It is highly durable with aluminum oxide ceramic impeller shaft and epoxy resin.
  • You will find the unit to be quite user-friendly.
  • The manufacturers offer clear instructions for maintenance of the unit making Installation a breeze.
  • The power cord is long and waterproof making it easier for you to use it.
  • Easy to clean as the pump head is detachable without you having to use any tools


  • Dry running is not an option.
  • Routine maintenance is required

9. Fountain Pump, 400GPH Submersible Water Pump



 Key Facts
  • Brand: CWKJ
  • Weight: 1.5 pounds
  • Flow rate: 400 GPH
  • Power: 25W
  • Voltage: 110 V-120V
  • Max lift height: 6.56ft
  • Cord length: 6.5ft
  • Dimensions: 3.2 x 2.8 x 2.3 inches
  • Provided with three nozzles, 0.51in 0.62in and 0.75in

This submersible water pump is another one you will find worth considering.

The best thing is;

The unit does not disrupt the environment.

The water pump can create circulation in the tank which makes your aquatic life feel at home.

It is suitable for medium-sized tanks and water gardens and can create a powerful water current.


  • The unit is provided with a compact design, and thus you will find it easy to hide it.
  • Disassembling is easy ensuring you do not have any problem in cleaning the unit.
  • A quiet operation which makes sure that it does not cause any distractions.
  • Different kinds of views can be created via the three nozzles that come with the unit giving you the freedom to decide what you prefer.
  • An adjusting knob gives you control over the pressure of water
  • Lifetime warranty


  • The rubber feet are a bit small

10.KEDSUM 880GPH Submersible Pump



 Key Facts
  • Brand: KEDSUM
  • Weight: 3.81 pounds
  • Flow rate: 880 GPH
  • Power: 100W
  • Voltage: 110V
  • Maximum lift height: 13ft.
  • Cord length: 4.9ft.
  • Dimensions: 5.1 x 5.1 x 3.9 in
  • Three outlet adapters included 0.51inch, 0.63inch, and 0.75inch

With a powerful speed flow, this submersible water pump is undoubtedly a force to reckon with.

Furthermore, despite its powerful performance, it is quite energy efficient.

The pump is versatile and can be used for saltwater, as well as freshwater.

You can use it with aquariums, spout and ponds with ease.


  • Quiet operation and thus does not disrupt the whole environment
  • Easy maintenance as you can comfortably detach the unit for cleaning without any difficulties.
  • Compact and thus you will find it quite easy to disguise or hide the unit so that it does not impede the beauty of the tank.
  • Three outlet adapters form part of the unit. Thus, you can decide on the water flow you find suitable.
  • The pump can be installed both horizontally and vertically owing to the mounting feet of the suction cups.


  • The inner shaft needs lubrication which might be harmful to sensitive fish.
  • The suction pumps tend to come off easily.

11.Driew 3W DC 3.5-9V USB Water Pump



 Key Facts
  • Brand: Driew
  • Weight: 0.1kg
  • Flow rate: 200L/H
  • Power: 3W
  • Voltage: 3.5V-9V
  • Cord length: 1.5m
  • Dimensions: 3.9 x 2.8 x 2.6 in

This Driew water pump is quite a high-quality product with impressive performance.

You can use it for fountains, aquariums, hydroponic system and spout.

Furthermore, it would not affect the beauty of your tank as you can easily hide it away.

You are also provided with control over the water flow of the unit.


  • Durable as it has been manufactured with a profound quality of reinforced ABS
  • It does not cause your power bill to burn a hole in your pocket as it is energy efficient.
  • Compact and thus can easily be hidden
  • Offers control over the water flow via a knob


  • It tends to make loud noises at times with no apparent reason.

12.Homasy 320GPH (1200L/H, 22W) Submersible Pump



 Key Facts
  • Brand: Homasy
  • Weight: 1.2 pounds
  • Flow rate: 320 GPH
  • Power: 22W
  • Voltage: 110-120 V
  • Cord length: 4.1ft.
  • Maximum lift height: 6. 56Ft
  • Dimensions: 4.8 x 3.9 x 3.4 inches
  • Provided with three nozzles, 51in, 0. 62in, and 0. 75in

When it comes to aquarium care, Homasy is a brand you can rely on, and this product is no exception.

You can use it in aquariums, fountains and spout.

Three nozzles are available with the unit, and you can decide which one you prefer.

On top of it;

You can use it to circulate water and oxygenate the water.


  • Provided with an ergonomic design that makes it a suitable option for aquariums
  • Easy maintenance as disassembling is not tricky.
  • It is quite powerful, capable of creating high lift owing to the strong suction cups it is provided with.
  • The high-quality hardware that the pump is equipped with makes sure that you get a smooth, powerful and yet quiet operation.
  • Adjustable water flow as a knob is available for the same ensuring you get desired results.


  • The power cord is a tad bit too short

13.Sunsun JVP-110 528-GPH Wavemaker Pumps



 Key Facts
  • Brand: SunSun
  • Weight: 0.1kg
  • Flow rate: 528 GPH
  • Power: 2.5W
  • Voltage: 220-240V
  • Dimensions: 3 x 2 x 3 inches

This water pump is one that you can consider if you have a small sized tank with a capacity of up to 30 to 60 gallons.

The model is completely submersible.

There is more; the unit is provided with an oil-free motor.

This is not all;

The unit is also provided with the feature of 360-degree rotation.


  • Ideal for small tanks due to its compact size
  • A submersible model which ensures you can place it anywhere in the water.
  • It is quite easy to install. All that you need to do is such the cup to the inner wall, plug the pump, and your work is done.
  • The power cable is long which ensures that you can easily install the pump anywhere in the tank.
  • Provided with an impressive flow rate
  • Offers a safe environment to the fish due to oil-free motor


  • Is not equipped with a controller and thus has to be adjusted manually

How Does An Aquarium Water Pump Work?

The purpose of an aquarium pump is driving the water into the filtration system or out of it.

Various types of pumps are used in aquariums.

However, all the pumps perform their function by creating a difference in the pressures of outgoing and intake valves.

Aeration Pumps

These pumps use air to exert force on the water.

When the air is pumped into a water tube, the water is dragged upward owing to the formation of rising bubbles.

The best thing; these pumps are quite reasonably priced.

However, they are suitable for only small tanks with a capacity of up to 20 gallons.

A vibrating pump is present when creates pressure along the tube.

It is connected to either the return part of the filter or the base of the intake.

If it is connected to intake, water is returned via gravity.

On the other hand;

If the pump is connected to the tube, the water is brought to the filter via a syphon.

Power Filter Pumps

These pumps use magnetic force to perform their function.

One of them is attached to the impeller present inside the filter.

The other one is attached to the motor.

As the motor starts, the magnet attaches to it starts to spin.

As a result, the one attaches to the impeller spins as well.

The water is thus pushed along the spinner owing to the spinning impeller in the direction of the filter or away from it.

External Pumps

External pumps are located outside the tank.

There are three subtypes, Diaphragm, centrifugal and peristaltic.


Diaphragm and peristaltic pumps are a tad bit complicated.

Thus, they are used by experienced aquarists.

Submersible Pumps

These pumps are driven magnetically and are installed in the tank.

They prove to be quite efficient and offer a great deal of convenience.

They are submerged in water. Thus, their electrical connections and motor are waterproof.

Some of these pumps may require lubrication for the motor.

Be cautious;

This can cause oil spills and be harmful to the fish.

Oil-free submersible water pumps will be a better option.

Should I Opt for Submersible Water Pumps or External Ones?

Submersible water pumps operate underwater.

They also ensure that your tank remains clean as the water is made to pass through the filter and UV sterilizer before making its way back to the tank.

On the other hand, inline water pumps are located outside the tank.

They use a hose system to filter the water.

Each has its own set of pros and cons.


Submersible pumps are quite easy to install since there is no drilling or tools required.

On the other hand, the installation of external filters might be a bit complicated.


Submersible pumps do not produce a lot of noise since they operate underwater.

The noise produced by the external pumps can get loud at times.


Submersible pumps can add heat to your tank.

Since external pumps are installed outside the aquarium, this is not something you will have to worry about.


The space available in the tank and the size of the pump is vital if it is submersible.

In contrast; external pumps do not have to take these factors into account.

Where Should I Place The Water Pump in The Aquarium?

This depends on what kind of pump you buy.

For instance, if you opt for a submersible water pump, it can be attached anywhere in the water supply.


It needs to be entirely underwater.

These pumps are equipped with suction pumps.

Thus, you can place them at any place where the suction cup holds, ensuring it remains submerged.

If you have external pumps, it is essential to keep it dry.

In-line pumps often need professional installation since they have to be installed out of the tank, without using suction cups.

You might have to drill a hole in the primary filter for these pumps.

This ensures that the systems connect and yet operate independently.

Think about it; it might be a better idea to opt for professional services to install an external pump.

He will make sure that the pump is placed in the right position and installed correctly.

Can I Install My Aquarium Water Pump Myself?

If you have submersible water pumps, you surely can.

These pumps are easy to install.

All that needs to be done is stick the suction cups somewhere they hold, and your work is done.

The suction cups will ensure that the pump remains submerged.

On the other hand;

External water pumps will not be that easy.

First of all, you will need to decide on a place where the water pump will be attached such that it does not come in contact with water.

A priming pot or pump box can be installed near the water to ensure this.

The pump can also be directly installed into the filter via a hole drilled into it.

Take a look at the instructions manual of your product.

In all probability, it will contain the details of how the product should be installed.

If you remain confused, you can always seek the services of a professional technician.

How Do I Decide Which is The Right Pump for My Tank?

There are a lot of factors you will need to consider if you want to make sure you get a water pump worth your money.

Size of The Aquarium

It is vital to pay attention to what your aquarium needs.

You might have the most powerful pump, but if it is not suitable for your tank, it will be worthless.

Furthermore, large pumps produce quite a lot of noise and heat.

On the other hand, a small pump might not have sufficient power, and thus you might have to purchase additional accessories.

The best option;

Consider the capacity of your tank and why you need a pump before deciding which pump to purchase.

Flow Rate

You might find a pump suitable for your tank if you match the tank size with the recommended size of the pump.

It is advisable to opt for a pump that is capable of circulating about four times the total capacity of your tank within an hour.

Pay attention; if the capacity of your tank is 50 gallons, get a water pump that has a flow rate of about 100-200 GPH.


This impacts the efficiency of the water pump.

If there is more resistance, you will need a pump with more power such that adequate pressure can be exerted.

Number of Returns

If you want the water to return from the filter back to the tank, you will need a powerful pump.

The water flow might decrease as the number of returns increase.


Think about it; can you imagine sleeping in a room where loud noises emit from the aquarium?

Too much noise is not problematic for only you and your family.

The fish also get stressed owing to it.

Therefore, try to make sure that the pump you buy does not disrupt the environment.

Generation of Heat

It is also essential to consider the heat a system will generate.

Find out if you can use any accessories to reduce this heat.


Fish are sensitive to any changes in the water.

Thus, significant fluctuations in temperature can be harmful to them.

Larger pumps produce more heat.

Make sure that your pump does not affect your fish negatively.

Are There Any Other Factors I Should Consider while Determining The Flow Rate for My Tank?

The capacity of your tank should influence the flow rate of water.

Keep in mind;

The pump needs to move at least four times of the capacity of your tank in an hour.

Higher flow rare might be required if you have large fish.

On the other hand, small fish need less flow rate.

But wait, there’s more;

There are some other factors to pay attention to as well.

The elbow turns in plumbing, the size of the outlet tubing and the head height should all be kept in mind while determining the flow rate.

How to Reduce The Noise of An Aquarium Water Pump?

Dealing with noisy aquarium water pumps can be quite irritating.

It is stressful not only for the family but also for the fish.

Therefore, it is crucial that you fix the problem at the earliest.

Using A Noise Reducing Mat

The vibration of a submersible water pump against the sides or bottom of a wet-dry filter or similar other surfaces can produce quite a loud hum.

It is common for pumps to be equipped with self-sticking foam or rubber heat to reduce this vibration.

This can be effective, but you will find a silicone mat to be more useful for the purpose.

These mats absorb the vibration, thereby ensuring that the noise is reduced significantly.


The mat first needs to be cut according to your pump.

You can then place it under the pump, ensuring that the ribbed side faces down.

These ribs will elevate the mat, which would make sure that the circulation of water is not affected.

If your mat is thin, you might have to use two instead of one.

Regular Cleaning

A lot of internal water pumps are provided with an intake strainer.

This filter prevents objects from getting inside the motor components.

Debris or dust might accumulate on the strainer with time producing a lot of noise.

This is because the pump has to work harder owing to the filter being clogged.

Cleaning it is easy, and all you would need is a small brush.

This is not all;

If the noise persists after cleaning the filter, you might have to take the pump apart.

Clean the impeller properly following the cleaning recommendations of the manufacturers.

Replacing The Pump

If despite all your measures, the pump is still producing noise, perhaps the time has come to replace.

Get one of the quieter water pumps available.

How Should I Select The Right Size for The Pump?

The first thing;

The flow rate suitable for the size of your tank needs to be determined.

You will then need to calculate the head height.

Head height is the distance present between the pump and the highest point where water has to be pumped.

All brands have specific flow charts.

Use one of your preferred brands to find out the model that will be suitable for your tank considering the head height and GPH.

Do I Need to Purchase Any Accessories for The Water Pump?

Yes. There are some accessories you will need to make sure your water pump operates appropriately.

These include hoses or tubing, clamps and ball valves and connectors.

Some other accessories might also be required for filtration or temperature control of the tank.

Some examples;

Protein skimmers, Chillers, and UV sterilizers

What Size of Tubing will be Suitable for My Tank?

This depends on your water pump.

The specifications of your product will have the answer.

This will reveal the size of the tubing needed to fit the pipe fitting threads of the inlet and outlet areas of the pump.

Remember; the size of the inlet pump should never be reduced.

Other Related Questions

Do saltwater require any special pump?

Mostly, the pumps are compatible with both saltwater and freshwater.

However, if you want the best for your fish, you might want to get a saltwater shaft seal to make things easier.

What is the powerhead for a fish tank?

Powerhead for an aquarium is used for creating flow in the tank.

A variable voltage system is usually used in reef aquaria.

The system creates movement in the tank similar to ocean water thus making the fish feel closer to its natural habitat.

Can you turn a fish tank filter and pump off at night?

Filters and pumps operate via motor, and it is highly unlikely that they would produce no sound at all.

You might be inclined to turn them off for the night.

However, if you do so, you are endangering your fish, and the measure can even prove to be fatal for your precious aquatic life.

Turning the filter off overnight can lead to the buildup of ammonia in the tank which makes the water toxic.

There’s more; since the pump is off, the water will not circulate or aerate.

Thus, you might wake up to find your fish dead if you turn the equipment off.

Why is water in fish tank cloudy?

It is usually the bacterial bloom which is responsible for the water in the tank turning cloudy.

When a new aquarium goes through a break-in cycle initially, the water can turn hazy.

Excess uneaten remains of food can also lead to milky water.

The bacterial bloom usually occurs a couple of days after the fish are introduced to the tank.

This initial bacterial growth is not harmful to the fish and clears on its own.

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