not sure why. i've got 4 48" vho's over it, 75 lbs of established liverock. other corals in the tank are doing fine, (frogspawn, xenia, toadstool, polyps, ricordia) it's not a branching, it's Euphyllia ancora. levels are as follows: Mg-1230ppm, Alk 7.6dKH, PH-8.3, CA-335ppm, trates-25ppm...