Bottom filter is rare in aquariums. It is difficult to clean and requires a primer with excellent water permeability. However, among its advantages can be called that it does not allow to stagnate water in the ground, which is especially important for plants.
The principle of such a filter is that water is pumped through a centrifugal pump or airlift. On the question - which bottom filter for the aquarium is better, you can answer that it is better that the filter that is combined with the aeration of water.
As for the filler for the bottom filter for the aquarium, there is not much difference between mechanical and biological filtration, as the bacteria settle on the filter material of the mechanical filter.
How to make a bottom filter for an aquarium?
Buying a bottom filter for an aquarium is not necessary, it's easy enough to do it yourself. To do this, we need three pieces of plastic pipe length, slightly less than the length of the aquarium, several corners, tubes, plug and expander.
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We also need transparent plexiglass so that we can lay the soil on the bottom of the aquarium. All pipes and corners must be welded together to form a single structure.
On the whole area of plexiglas, we need to drill a lot of holes for normal air circulation. Do it best with a drill with a nozzle "feather". First, make a small hole, placing the nozzle at an angle, then turn it straight and drill.
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Also, we need to make a lot of holes on the underside of the plastic pipes, for which we use a drill with a nozzle in the same way.
After this, we need to build and weld the structure to further connect it with the filter pomp. The pump will be connected to the expander.
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We put the finished structure on the bottom of the aquarium, cover it with plexiglass and cover it with soil.
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By connecting the pipes to the filter and putting it into operation, pour in the aquarium water, lay out decorations and run the inhabitants.
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