5 Undergravel Filters For Fish Tanks That Will Make Your Pets Happy

If you wish to get an aquarium, you must also plan on keeping it clean. Most aquariums do not have self cleaning mechanism, hence you will need to turn to filters for this job

Reports indicate that filters are quite effective in cleaning the water and keeping the fish save. While there are many types of filtration systems available to choose from, undergravel filters for fish tanks are your best bet due to a number of reasons.

Undergravel filters contain a filter plate that lets water flow freely under the gravel, which blocks both small and large particles of waste and dirt. The gravel acts as a biological and mechanical filter, and keeps the water clean and free of any contamination.

There are many undergravel filters out there, but not all are the same. Typically, they last for years and require no maintenance, except for regularly cleaning the gravel. However, many of them do not come with a lift tube and air pump, which you might have to buy separately. Moreover, some of them have carbon cartridges that may affect performance.

To help you make the right decision, let’s have a look at 5 undergravel filters for fish tanks to choose from:

SPOILER ALERT... Here are our FAVORITE PICKS:

OUR FAVORITE PICK
Penn Plax Undergravel Filter – Premium Aquarium 4 Filter Plate System Designed to Fit 40/50 Gallon Tanks
Lee's 40/55 Premium Undergravel Filter, 12-Inch by 48-Inch
Under Gravel Filter 7.8"x5.5" Undergravel Filteration for Fish Tank Air Pump
Hexagon Aquarium Fish Tank Under Gravel Filter Medium Hexagon 12.5" x 7"
uxcell Plastic Aquarium Undergravel Filter Board Air Pump Line Hose Tube 24 Pcs Black
$16.99
$27.99
$14.00
$20.99
$25.41
-
140 Reviews
95 Reviews
10 Reviews
4 Reviews
2 Reviews
OUR FAVORITE PICK
Penn Plax Undergravel Filter – Premium Aquarium 4 Filter Plate System Designed to Fit 40/50 Gallon Tanks
$16.99
140 Reviews
Lee's 40/55 Premium Undergravel Filter, 12-Inch by 48-Inch
$27.99
95 Reviews
Under Gravel Filter 7.8"x5.5" Undergravel Filteration for Fish Tank Air Pump
$14.00
10 Reviews
Hexagon Aquarium Fish Tank Under Gravel Filter Medium Hexagon 12.5" x 7"
$20.99
-
4 Reviews
uxcell Plastic Aquarium Undergravel Filter Board Air Pump Line Hose Tube 24 Pcs Black
$25.41
2 Reviews

Last update on 2018-04-25 at 08:45 Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.

1. Penn Plax Undergravel Filter

Penn Plax Undergravel Filter – Premium Aquarium 4 Filter Plate System Designed to Fit 40/50 Gallon Tanks

The Penn Plax Undergravel Filter is one of the best undergravel filters for fish tanks suitable for a 40-50 gallon fish tank. This undergravel filter makes it easy for you to clean the water as it is composed of 4 plates that do the cleaning job. The filter mainly performs biological filtration to get rid of dirt particles and that too with no maintenance at all.

Beside dirt particles, fish tanks can sometimes get filled with chemicals and bad odour which can affect the health of the fish inside and also destroy the look of the aquarium. To provide solution to this problem, this undergravel filter has 2 carbon filters whose job is to clean the chemicals found in the fish tank and keep the fish out of danger.

The Penn Plax Undergravel Filter also has a special option that allows you to adjust the height of the water level by adjusting the 1” jumbo lift tube in the filter.

It is extremely easy to set up in your aquarium and will give you no trouble. However, you have to buy an air pump for it and a power overhead as well if you wish to increase the amount of oxygen for your fish inside the fish tank.

Remember that this filter can break easily, so make sure you are very careful during the installation.

Pros

Cons

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    Water level can be adjusted via life tube.
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    Doesn’t affect the aesthetics of the fish tank as it hides from the view once covered in gravel.
  • Not very durable.

2. Uxcell Plastic Aquarium Undergravel Filter Board

uxcell Plastic Aquarium Undergravel Filter Board Air Pump Line Hose Tube 24 Pcs Black

This undergravel filter is made up of 24 assembled pieces and can easily fit in your fish tank. The bottom plates of the filter can be connected according to the size of the fish tank.

The set up is extremely easy and since the plastic cells are nicely crafted into tiny squared shapes, unwanted particles are easily trapped into them and the water is kept clean.

There’s a long tube and an air hose to promote good aeration in the fish tank. Overall, this undergravel filter for fish tank is a great product that works like a charm. However, there’s one flaw in it, the tube isn’t much durable and might not stretch a lot in case you have a higher level of water in the tank.

Pros

Cons

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    No maintenance.
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    Easy set up.
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    Cheaper.
  • Tube is not of good quality and also does not stretch much.

3. Aquarium Equip Under Gravel Filter 7.8"x5.5"

Under Gravel Filter 7.8'x5.5' Undergravel Filteration for Fish Tank Air Pump

This undergravel filter is suitable for both saltwater and freshwater tanks. There is however a limit for adding the gravel on the filter which should be around 1 to 2 inches and it also needs to be thoroughly rinsed before being added to the fish tank.

This filter is a perfect fit for compact fish tanks where oxygenation can be a problem as the air pump is especially designed to circulate aeration throughout the fish tank.

Moreover, the pipe that accompanies the filter can be easily fitted with any outer filter or submersible filter to have good filtration in the fish tank.

The flaw of the product is that the tube doesn’t fit properly and constantly keeps on moving which can look a bit odd to the viewer.

Pros

Cons

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    The filter is perfect for both salt and fresh water.
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    Aids in aeration.
  • Only suitable for fish tanks that are smaller.

4. Hexagon Aquarium Fish Tank Undergravel Filter Medium Hexagon 12.5" x 7"

Hexagon Aquarium Fish Tank Under Gravel Filter Medium Hexagon 12.5' x 7'

This undergravel filter can work for fish tanks up to 20 gallons. The filter comes with one uplift tube which is responsible for filtering and clearing out dirt and debris from the fish tank.

There’s also an airline which you will get when you buy this undergravel filter. The airline is an inch in size and should be connected to the end of the filter plate to stop the water from running back into the air pump.

This is one of the best undergravel filters in fish tanks because it cleans up the toxic wastes efficiently and also helps you get rid of any harmful chemicals that may be present in the water.

However, on the downside, the plastic from which it is made is very thin and might not support hard gravel substances.

Pros

Cons

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    Is very stylish and can improve the look of your tank.
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    Is perfect for both big (up to 20 gallons) and small tanks.
  • The uplift tube is only one inch in diameter and might not flush bigger debris particle from the water.
  • Made from very thin quality plastic.

5. Lee's 40/55 Premium Undergravel Filter

Lee's 40/55 Premium Undergravel Filter, 12-Inch by 48-Inch

With this undergravel filter you can have convenience and the ability to keep your fish tank highly maintained and free from harmful substances that may contaminate the water and affect the fish.

Just like the system discussed above, this filter also has an uplift tube that makes sure that the water is circulated properly and in all corners. The carbon cartridges in the filter clean up the bad chemicals that are formed because of fish waste and also make sure that the water doesn’t not smell.

The plates of this filter are extremely durable and resistant to cracking, which is easily one of its best qualities as this system has a good shelf life. Moreover, the durability means you can also easily place elements like rocks and other various equipment without any fear.

However, for a 55 gallon tank, the bottom isn’t completely filled with purified water and can be a bit troublesome.

Pros

Cons

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    The air diffusers and carbon cartridges are durable and efficient in making the contents crystal clear.
  • The air stones are small and aren’t suitable for bigger tanks.

Conclusion

While there are many types of filtration systems available that claim to be the best when it comes to filtering fish tank water, undergravel filters have their own charm.

They filter the debris and other impurities through biological filtration, however some filters also offer mechanical filtration. However, make sure you do your homework and choose the type of undergravel filter which best fits your fish tank size.

The above 5 undergravel filters are amazing when it comes to keeping the water pure and promote a rich and healthy environment for the inhabitants.

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