They really like and eat Phytoplankton which is in the US generally formulated into a bottle and is called Marine Snow, or DT's Phytoplankton, among many others. Some of the larger polyp stonies (Bubbles, Pearls, lg Hammers) we feed some small pieces of shrimp and they seem to enjoy that as well. But anyway, Phytoplankton is what you need and it says on the bottle how often. We do ours in smaller doses than recommended but everyother day rather than once a week. Anyway, hope this helps and good luck.