How to make the filter screen at the bottom of the fish tank?

First, filter

1, trickle: trickle box, submersible pump.

2. Upper filtration: upper filtration box, submersible pump or three-in-one pump.

3. Filter barrel: various models.

4. Bottom filtration: bottom filter cartridge, bottom cabinet, pipe fittings and water pump.

5. Anti-gas lift: anti-gas lift and water pump.

Second, oxygen.

1, water pump+bubble stone.

2. Ozone machine+water pump+bubble stone.

Filter at the bottom of the fish tank-that is, the filter installed under the fish tank.

The function of bottom filtration is not to suck away impurities, but to make the water at the bottom of the sand move and have enough oxygen to allow nitrifying bacteria living at the bottom of the sand to multiply. The breeding conditions of nitrifying bacteria are: water flow, high oxygen, bacterial bed and fish, so its function is like this.