I ran a mag 9.5 return on a SCWD (approx 500gph) and a MP10 full tilt on a biocube 29 and I had LPS, SPS, and some softies as well as a giant brittle star, clowns and a pink spot goby. So I think you'll be ok....IMO more flow is better....
ok so say i wante to run 2 of these powerheads one on each side of my tank to eliminate dead spots the powerhead i am looking at is the Hydor Koralia Evolution Powerhead (240 GPH) for nano's. Is this going to be too much flow for a 20g or is my best bet to just get the 2 o them and try it out an once i have livestock in my tank let the livestock tell me if its too much or not lol
thanks for the input guys i ordered 2 of the powerheads i wanted and if its too much i can always take 1 out but i think my clowns when i get them will enjoy the surfing lol