I use 3 Darts to run my 400 gallon display. One Dart on each CL (2) and one Dart for the sump return. This sounds similar to what you are thinking, and my tank is larger.
I certainly have no trouble growing SPS. My only concern is for when the SPS reach enormous sizes and start to block the movement of water around the tank. At that point, I may have to upgrade the Darts.
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank: http://www.canreef.com/vbulletin/showthread.php?t=28436
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