What is the best kind of ceremic ring or need mix different stuff?

[xconnect.]

Is there like different kinds of ceremic ring that specialize on like ammonia removal then for example nitrate removal or these different bbs life together? Any expert ?

[takaco]

http://scialert.net/fulltext/?doi=ja...46.1150&org=11

[issacyeo]

ammonia to nitrite is one type of bb; nitrite to nitrate is another. removal of nitrates can be achieved by regular water changes.
the latest filtration in the market, which supposedly prevents ammonia spikes, is the K1 moving media.