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Sponges do a great job on the bio. Only so-so on the mechanical--if you're committed to do that frequent of WC with serious vac'n around the rocks you'll be fine. I use lot's of sponges as primary filters but primarily in bare bottomed minimally rocked fry/juvie tanks. Once I move into situations with substrate/more rocks/2+" fish, I prefer a small (HOB) mech filter with the sponge.
 
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