I bought three Red Mushrooms over a year ago, and now I have hundreds, with more every day. I give them away, I ship them away, I do all I can to control them and they continue to propagate like Tribbles! All who've received them tell me how well these do even under very intense lighting. From tiny to 5" in diameter, they do add color to the tank, but they can sting other corals as they seek to gain new territory. At night they shink in size when the lights are off.