I don't think watts per gallon are so important as to direct light. I had mine under 150w MH and it wasn't very happy. When I moved to my other tank that had 8T5s and I placed the corner as far from direct light as possible. It then blossomed it puffs out more and more everyday! I don't think these corals are found in shallow water, so moderate light is where they excel. Make sure your feed it at night