getting my 20 gallon tomorrow, tank, hood and lights for 25$. im going to put a pair of convicts in it and keep the 10 gallon going for the fry. im going to use an aquatech on the 20, not sure what size, it kinda fell into my lap its small though, it was on a 20 or 29 when i found it. it doesnt have a water flow adjustment, and since it will be in with the convicts, i have to watch for fry. i was going to use some sponge on the intake, any special kind of sponge or can i just go grab some unscented sponge at the dollar general?