I bought three Red Mushrooms, and a year later I had hundreds, with more every day. I gave them away, I shipped them away, I did all I could to control them and they continued to propagate like Tribbles! All who've received them tell me how well these did 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 shrink in size when the lights are off. They spread via pedal laceration or spin off and drift to a new location to attach elsewhere.