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My 40 gallon breeder grow out tank. Forgive the dirty glass. Filtration consists of a Fluval 306 and ZenBlue HW402B. A sponge filter and air stone provide extra surface agitation. I also have a 528gph wave maker that I turn on from time to time to stir things up a bit. Filters are "rated" at 568 gph, so I figure I'm closer to 400 gph which will be around a 10x turn over rate.