I agree with the LR thing. Just keep "atleast" 10 lbs. and you should be good. No filter is needed in a 10 gallon tank. I have a 12g Nanocube and in the back I only left a sponge to help keep my water clear. Just rinse it out when water change day. There are powerheads that can have a pre-filter. Just rinse it when doing the water change and you should be good too.
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