Sponge filter

[23matt3]

I just bought a sponge filter and my fire bellys don't seem to mind it. I just want to know how efficient are they? I have a 10 gallon and it is a 20 gallon filter


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[Chinadog]

It should be fine once the sponge cycles. I always use sponge filters on small tanks, they do the job perfectly and don't cause too much water movement.