What do you plan on keeping? What you decide to keep could help you decide on how much turnover you'd want in your tank.
I've got a 15g right now... (35"x12"x8") and I've got about 50gph coming from the return pump, 240gph from a Koralia nano, and 400gph from a Koralia 1... so total of about 690gph or 46x turnover. I plan on eventually keeping some LPS and a BTA. Currently housing a couple of gobies and a tailspot blenny. Seems like a lot of flow, but the powerheads are quite gentle, so it works for me.
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