Those of you with Seaswirls, would a 1/2" swirl mounted in the center with the "Y" fitting with 180 rotation work on a small tank like a 20 long? Would probably be running at 350-400gph from sump. I also will have a Seio 620 mounted in one corner pointed slightly down and across toward the other corner. Would this be overkill flow? The tank is going to be SPS/clam.