Maybe I should have been more clear with my question, I feel bad because it sounds as if I haven't read the thread.. I have. What I meant was the bulkhead/piping system to get to the sump and then of course how the sump was going to be used... whether the standard clasic mech/bio/return, or something like a refugium or algea sheet combo? I built mine with the idea of using a classic style sump. However, when I found my flow rates were lower than anticipated I rethought my design and made a plant filter...