those gases are light and quickly dissipate if the water is going over a waterfall
with lots of rocks. I doubt it would be toxic at that point. but it does smell bad
while in the veggie filter. I just dont know why anybody would make it deep when
shallow does great. Ingrid

"RichToyBox" wrote:

It is not whether the water will change going over the waterfall, but the
action of the type of bacteria, and the waste products produced. Aerobic
digestion does not produce hydrogen sulfide or methane which smell bad and
are toxic to the fish.



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