Well, you have taught me something already. I have a couple of sps frags growing in my tank, both are in the high flow area of my tank, one has decent vertical growth, the other just a little bit. When it comes to encrusting on both of these corals though, they should be full blown colonies for the amount of encrusting they have. Never dawned on me that the flow they were getting might be part of the problem. I turned down both MP40s by 4 dots, they were at one dot from being wide open, plus I have a Gyre in the tank also at 40%, the tank is a 150g at 48x30x25 Anyway, I turned down both MP40s after reading this, and will see what happens