What do you mean by a ceramic cup in a fish bowl?
Is it a ceramic ring?. Nitrifying bacteria can adhere to it and grow on it.
The ceramic cup of the fish pot is a ceramic ring.Ceramic ring is a kind of common biochemical filtration material. Because ceramic rings are full of tiny pores, it is suitable for nitrobacteria to attach and propagate. A large number of nitrifying bacteria on the ceramic ring can convert the toxic ammonia nitrogen produced by organic matter (residual bait, excrement) into basic non-toxic nitrate, thus playing a role in purifying water quality. Ceramic rings are usually used in the filter.
Biochemical filtration, the cultivation of nitrifying bacteria, water quality is better ~ dirt decomposition faster ~!
