Why Do We Need An Internal Filter For The Aquarium

Why Do We Need An Internal Filter For The Aquarium

Do I need a filter in the aquarium :: Equipment and accessories

For the aquarium to delight the eye, and its inhabitants are always healthy, it requires careful maintenance and the use of special equipment. One of the required attributes of a densely populated aquarium is a filter.

Aquarium without filter

Is a filter always necessary in an aquarium? No, if there are few inhabitants and there are about 10 liters of water for one fish up to 5 cm in size. In this case, biological balance will be established in the aquarium even without a filter, and with regular removal of debris accumulating at the bottom of the garbage and a weekly change of 1/10 of the water, the fish and plants will feel quite good. In an aquarium without a filter, there must be aeration, it contributes to the saturation of water with oxygen and the oxidation of harmful substances. If the population of the aquarium is large, a filter must be provided.

Fish Tank Filters

What do you need for an aquarium?

If you decide to start an aquarium, then the question inevitably arises before you: what is needed for normal functioning of the aquarium, what minimum equipment should be purchased to make the fish feel comfortable.

Do I need a filter in the aquarium?

Unfortunately, an aquarium is not a closed and self-sufficient system, and the water in it must be constantly cleaned, otherwise it will quickly bloom and become cloudy. Filter – this is one of the most necessary devices for the long-term maintenance of fish. If you have a small aquarium up to 60 liters, then the best option would be to buy an internal filter, for larger tanks of 200, 300 and even 500 liters, an external filter is simply needed, which has a more elaborate cleaning system and is easy to maintain.

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Do I need light in the aquarium?

So, what else besides the filter you need for a home aquarium and should also be purchased in advance. Many experienced fish owners recommend never relying on sunlight or putting a container of water under direct sunlight. So the water will deteriorate quickly, and its temperature will jump during the day. But the twilight is also not the most favorable conditions for the life of the inhabitants of the aquarium. Therefore, it is simply necessary to purchase a suitable aquarium lamp or lamp that will provide a comfortable environment.

Do I need a compressor in the aquarium?

Finally, the third necessary device in the aquarium is a compressor that provides water saturation with oxygen. Compressors are of two types: internal and external. External do not occupy space inside the aquarium, but when working they are quite noisy, internal ones are quiet, but they take up a lot of space inside the aquarium.

Do I need a heater in the aquarium?

The decision of this question depends on what types of fish you are going to contain. If this is a thermophilic and capricious tropical species, it is better to get a modern water heater for an aquarium that will maintain a constant water temperature. For more stable fish, you can first bring the water to the required room temperature, which will continue to persist. What you really need is a thermometer that will show vibrations, and you will not be able to respond to them in time.

Bottom filter for aquarium

Bottom filter design

How does the bottom filter work?

Advantages and disadvantages

Before installing the bottom filter should be familiar with its features. Of course, the first minus will appear immediately. To install the system, it is necessary to completely drain the water from the aquarium, remove the soil and all the decorative elements, which takes a lot of time.

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The indisputable advantage of such a filter is:

  • continuous circulation of water from the entire aquarium;
  • when passing through the soil, it stagnates at the bottom;
  • Such a water cycle allows you to avoid rapid contamination of the aquarium and the emergence of various kinds of infections.

Aeration of the soil helps the algae to strengthen and develop their root system, but when the soil is oversaturated with oxygen, leaf growth slows down. In addition, in the soil there are no nutrients for algae, they go along with the water. Therefore, this design solution is not recommended for use in an aquarium where a lot of greenery grows.

Even when using a bottom filter, dirt particles still remain on the ground surface. They do not pass through it due to its large size. Therefore, as mentioned above, you have to wash the pebbles. But you can avoid unnecessary mess with changing water and washing the soil.

For this you need to put an additional filter element that will have time to drive through all the water. Or you can buy a device – a siphon, which removes large particles of dirt from the surface of the soil (this procedure is preferably carried out weekly).

Another drawback of the system is that the holes in the tubes quickly become clogged with debris. To clean them, you need to completely pour water from the aquarium and disassemble the entire structure. For a small container (up to 50 liters) this will not cause a particular problem, but for a large aquarium it is very difficult and hard work.

Read more:  How To Install A Filter In The Aquarium And Properly Operate It

How to make a bottom filter yourself?

Is there an alternative to the bottom filter?

Many aquarists claim that bottom filters can already be left in the past. Of course, they quite effectively clean the aquarium from contamination, but to maintain cleanliness, additional methods of care are required. There are alternative devices: external and internal filters.

Each model is designed for a specific volume of the aquarium. Also filters can include the device for aeration of air – the compressor. Such devices are able to pass through themselves the entire volume of the aquarium in just 10-15 minutes.

The advantage of such filters is quick installation and easy maintenance. To make cleaning, it is enough to disassemble it and wash all the structural elements under the faucet.


The bottom filter is an effective way to filter water, which allows it to be cleaned naturally (passing through the soil). This type of construction has both advantages and disadvantages, which is why many aquarists do not dare to acquire it. But why spend money if you can build yourself a bottom filter from inexpensive materials?

This type of filtration was known at the end of the last century, but it is still used today. Difficulties in installation and maintenance make fans switch to more modern methods of water purification using external and internal filters (the latter are attached to the inner wall of the aquarium).

Video to create a bottom filter for an aquarium: