My nitrates on my 30 gallon are zero, along with every other level. On top of that, I also have a seahorse that eats frozen food 4 times a day. I don't do anything fancy with it, simply a canister filter with 3/4ths biomedia, no refugium, etc. as of yet. As long as you get good flow in the tank, along with regular cleaning, I see no reason why canisters cannot be used. Great alternative to those of us who can't just go out and buy a sump, etc.
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