This will be a SPS dominated tank- very few softies and some LPS. I'm pretty much using all my equipment from my other tanks . . . so for flow this is what I have: Return: I have a Mag9.5 not being used . . . I don't want to be pushing this much water through my sump, but the return line will be T'd off to feed my 30g prop tank, so there will be some headloss- I'm thinking in the ballpark of 500gph reaching the display . . . Closed Loop: I have a GenX 40 pump being used on my 58g that pumps out 1190gph . . . I also have been talking to someone who is selling a Sequence Dart for cheap- never used. That would be substantially more flow. I'm thinking 2 outlets for the GenX and up to 6 if I go the Dart route. These will be over the top since I don't want to drill the back of the tank. Powerheads: I have 2- Tunze Stream 6000's on a multicontroller for this. I can always upgrade the transformer to make them stronger . . . Ya'll think that should be enough flow?