I have a 150, closed loop with Dart (3600gph)on a OM 4way and return from sump at about 1500 gph going through a wavysea, and a wavebox (unknown amount of flow). Sps are growing like crazy for the most part and the only coral I've lost so far are due to me going away and not being able to rescue a frag that has fallen into a hammer coral and another frag due to another sps growing into it and touching it and stinging it. So I'd say my flow is sufficient (for now.....we'll see when the corals grow huge).
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