What is the best place to put anthelia? Right now I have two small rocks with anthelia that were doing great when I got them. I put them on the bottom of my tank where they receive moderate flow ( enough to keep them swaying ) and are under 2x150W MH's with 130W PC supplementation. If you look in my tank thread you see how good they were when I first got them but they are no longer doing as well with maybe 25% of the polyps gone or shrivelled.