A little bit of advice from a person who grows a lot of zoanthids. those brown polyps may be something you don't want in your tank at all. I have some, and I have found they grow where you don't want them. I have tried to scrub my LR to no avail. I am hoping the introduction of a Pearlscale Butterfly, which someone does not want because it attacks polyps will help me get rid of them.
