06-06-2012, 07:40 AM
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First, I don't think I'd push dirty water from one tank to the next - I think I'd have each dump directly into the sump and either add another pump, or a splitter for the separate returns. I'm not quite sure that I'm "seeing" how a pond pump supplies the API NEXX filter - seems like way to much pressure. In any event, why not use the 20g as a conventional sump with mechanical and bio filtration right there...perhaps augmented by the NEXX filtering water in the sump?
Note: If not already, make sure your overflows are setup to break the siphon in the event of a power outage (a hole just below the water line).