The fish food is filtered and sucked away, indicating that the power of the filtering equipment is too high and the water flow speed in the fish tank is too fast. In view of this situation, the best solution is to turn off the filter for a period of time when feeding, and then turn it on after feeding. A feeding circle can also be prepared so that food and fish are confined inside and will not be filtered and sucked away.

1. Physical filtration: Physical filtration is indispensable in the filtration equipment. Its main function is to filter out impurities in the fish tank, such as uneaten residual bait, fish secretions and excretions, etc. The filtration equipment will form water flow and suck these dirt into the filter tank, thus making the fish tank look cleaner.

2. Biofiltration: Biofiltration is also very important for fish tanks. After the dirt in the tanks is decomposed by microorganisms, a large amount of ammonia nitrogen will be produced, which will be harmful to fish. Biofiltration is mainly nitrifying bacteria, which can convert ammonia nitrogen into nitrate, thus ensuring the safety of water quality.

3. Chemical filtration: Chemical filtration mainly uses various chemical reagents to improve water quality, which is rarely used in family fish farming, but is more common when fish farming in fish ponds, such as using flocculants to adsorb impurities in water to make water clear, or using algae removers to kill algae.