Best Internal Fish Tank Filters Reviews

When a person acquires an aquarium, he seeks to equip it at the highest level. Responsible approach to the choice of soil, aquarium plants and decorations. This is one of the elements of a full-fledged artificial reservoir. But there is a more important thing necessary for the normal functioning of the future house for fish. This is an internal filter for an aquarium.

What is a filter, and what is it for? What are the devices for water aeration? How to care for them? What is the difference between the filters of famous brands Aquael and Tetra? Answers to these questions are given in the article.

What is a filter and what is it used for?

This is a device for water purification and its oxygenation, i.e. aeration. Depending on the liter capacity of the last internal filters for the aquarium are different in power. The device cleans not only water but also the soil.

What are the filters?

Devices are divided into four types:

  1. External filters for aquarium.
  2. Internal filters for aquarium.
  3. Bottom filters.
  4. Mounted filters.

External filters

External filters are installed in aquariums in excess of 300 liters. The device is placed near the tank, two hoses are immersed in water. One of them serves for pumping dirty water, the second fills the aquarium with clean water after a preliminary cleaning system. This type of filter is efficient and economical. However, the cost is quite high and the equipment takes up a lot of space.

Bottom filters

Their second name is false. The filter plate is laid on the bottom of the aquarium. Top closes ground. Since the filtration is carried out from below, the water is purified in two ways: through the filter and through the soil. These devices are not suitable for large aquariums because of their poor performance. It is also noted that they are difficult to operate.

Mounted filters

This device is popular with aquarists. The device is installed near the wall of the aquarium, and the filter device itself (filtering mechanism) is lowered into the tank. The performance of this type of equipment is different. But for small aquariums, they are not suitable.

Internal filters

Internal filters for the aquarium are the most popular among professional aquarists. The mechanism is installed inside the fish house. The main advantages of the internal filters are the following:

  1. Affordable price.
  2. Easy operation.
  3. High performance. The device can work both in an aquarium from 3-5 liters, and in the tank of 250-300 liters.
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Best Internal Fish Tank Filters Reviews

What are the internal filters?

Filtration systems are divided into three types:

  1. Mechanical.
  2. Biological.
  3. Chemical.

Next, we consider them in more detail.

Mechanical cleaning

Water purification is carried out using a sponge located in the filter cup. Water is taken from the bottom through special holes in the glass. Particles of debris and dirt settle on the sponge, and the water from the filter comes out already cleared.

Filters with this cleaning method are suitable for various aquariums.

Best Internal Fish Tank Filters Reviews

Chemical cleaning

The basis of the internal filters for an aquarium with a chemical cleaning method is coal. Water passing through the carbon filler in the filter, leaves an unpleasant smell, pollution, and most importantly, ammonia. It is filled with useful impurities and minerals and in this form goes into the tank.

Best Internal Fish Tank Filters Reviews

Biological cleaning

One of the most effective. In the aquarium environment, the role of the cleaner performs the soil. Filters have special biological fillers populated with beneficial bacteria. Cleared with their help, water loses the toxins formed as a result of the vital activity of fish and the death of plants.

Aquael filters Aquael

The manufacturer of a series of data filters is Poland. Devices are quality, and the price is not particularly high. There are several types of internal filters for the Aquael aquarium:

What is the difference between the models? The smallest device is designed for an aquarium up to 30 liters. The biggest one – Fan-3 – will perfectly cope with water purification in an aquarium of 150-250 liters.

Best Internal Fish Tank Filters Reviews

Filter data device

All of the above devices – mechanical water purification. What is their device? A sponge is inserted into the filter bowl. From above the pump with the regulator of power of a stream is put on. A rotor is hidden inside the pump. In addition, the device is attached to a hose or aeration tube, suction cups, holder, water flow deflector, aeration tips.

How to use the device?

The assembly mechanism is extremely simple. Each type is attached instructions for use. Even a novice can assemble and attach in an aquarium.

Now it is necessary to figure out what to do with it further. If you need to adjust the power flow, it is enough to turn the regulator. It is located on the pump and is a small gray switch.

For greater cleaning efficiency, the hose (aeration tube) can be attached on one side to the aeration attachment, and the other connected to the aeration regulator. The power of aeration is regulated by opening or closing the regulator.

Read more:  How To Maintain Fish Tank Filter

Best Internal Fish Tank Filters Reviews

Filter care

In fact, nothing complicated about it. Periodically it is necessary to rinse the sponge, tumbler and rotor. The fact is that the filter is contaminated, and the aeration of the water weakens. How to properly wash the device will be explained below:

  1. Before rinsing the appliance, it must be disconnected from the mains.
  2. Then the filter is carefully removed from the aquarium.
  3. The glass is removed. Click on it in the places indicated.
  4. Removed sponge.
  5. Washing the glass is carried out under a stream of clean water.
  6. The sponge needs to be washed in aquarium water. For her washing under running water will lead to the death of all beneficial bacteria. And this is, in fact, the restart of the aquarium.
  7. The rotor is washed twice a month. To do this, it must be removed from the filter and rinsed under running water.

additional information

Every six months, the sponge in the filter must be changed. As well as suckers are replaced once a year.

Internal filters for aquarium Tetra

Devices are divided into 4 types:

  1. Tetratec in 400.
  2. Tetratec in 600.
  3. Tetratec in 800.
  4. Tetratec in 1000 Plus.

All devices in this series have removable cartridges. Therefore, they do not have to be washed. It is only necessary to change the cartridge in time. Let us consider in more detail how the filters differ from each other.

Best Internal Fish Tank Filters Reviews

Tetratec in 400

The filter is designed for aquariums up to 60 liters. Its capacity is 200-400 liters per hour. There is one double replaceable cartridge. Therefore, water purification is carried out both mechanically and biologically. There is a biological sponge and activated carbon in stock.

Tetratec in 600

The model is designed for tanks up to 100 liters. The filter capacity is 300-600 l / h. There are two double replaceable cartridges. The device enriches water with oxygen, and a current close to the natural is created in an aquarium.

Tetratec in 800

This mechanism is able to serve the aquarium up to 150 liters. The performance of the device reaches 800 l / h. It has two cleaning chambers (cartridges). Due to this, one of them can always be in the aquarium when replacing the second. The design of the device is such that you can remove and replace the fillers so as not to touch them with your hands.

Tetratec in 1000

This internal filter for aquarium 200 liters fit. Its maximum capacity is 1000 l / h with a power of 14 W. As in previous models, there are two interchangeable cartridges, as well as a spare set consisting of a sponge and activated carbon.

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Comparative characteristics of Aquael and Tetra

Choosing a model, the future aquarist asks: what is the best internal filter for an aquarium? These tables reflect the capabilities of the two most popular brands on the market. The first is Aquael.

Next, consider the products Tetra.

As can be seen from the tables, Tetra filters differ significantly from the Aquael series in power and performance.

Learn more about Aquael

In addition to the above professional filters, the company is engaged in the production of so-called amateur equipment. This equipment series Aquael Asar and Aquael Unifilter. These models are designed for amateur aquarists. Unlike the Fan series, they have less power and performance.

It is necessary to know

The closer the filter is attached to the bottom, the worse the aeration of water.

Aquael Micro Plus is able to work at a depth of 3 cm. It is ideal for small round aquariums.

The best internal filters for the aquarium produces Poland (Aquael) and Germany (Tetra).

Best Internal Fish Tank Filters Reviews

Aquarist Reviews

As always, opinions are divided. Other aquarists are satisfied with Tetra filters, agree that the devices work well enough, without complaints. And someone says that after the first disassembly and washing the filter began to work worse, buzzing. And even it flows.

Reviews of the internal filter for the aquarium of both brands are different. Choose a device for the aquarium should be carefully examining the technical characteristics.


Which internal Fish Tank Filter is the best? There is no objective answer to this question. How many people, so many opinions. One likes the Polish company Aquael, others prefer the German brand Tetra.

What to consider when choosing a filter? First of all, technical specifications. It is necessary to understand that in an aquarium with a volume of 50 liters a filter designed for servicing a 30-liter tank will be insufficient.

Secondly, the price category. A good filter cannot be cheap. The average price of devices with a minimum performance is 800 rubles. The more powerful the device, the more expensive it is.

And thirdly, you should think about the future inhabitants of the aquarium. For small fish do not need huge tanks with a powerful filter. The flow of water will destroy the fish. Conversely, small filters are not placed in large aquariums. Insufficient amount of oxygen will kill its inhabitants.