How to reduce the mortality of perch and mandarin fish in hotel fish tanks? The salt water concentration is fine, and so is the light. fish

Do you mean the hotel keeps fish to eat? According to the size of fish and the density of fish in the fish tank, don't raise too many fish. The fish tank in the hotel will turn over every day, which will affect the water quality. We can get some filter materials to filter the water outside. Generally speaking, the fish in the hotel aquarium will not stay in it for too long, but if a large number of fish in the aquarium are found dead, it is recommended to disinfect the aquarium again.