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Re: Filterless Discus
Alan said, in part:
" . . . Let me stipulate that I am not a fish genius. But
having said that, I don't think one should advocate
keeping discus without biological filtration, without
saying exactly you mean by water changes. . . . ""
The conversion of toxic fish wastes to a less harmful substances
(AKA "biological filtration") can be done without filtering.
Healthy aquatic plants consume the ammonia (or ammonium)
directly, without waiting for it to be converted to nitrates.