Canister filters are much maligned but they aren't as bad as people say. A thorough cleaning every couple weeks and they are fine. Sump filtration is definitely the way to go but if that's all you have then don't worry.
1lb per gallon is what I went with, any more and I'd have had a rock tank instead of a fish tank.
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I have to go out and buy more snails for my hermit crabs.
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