I have Green Mushrooms, Assorted Mushrooms, and a Yellow Polyp stone. The 'shrooms are doing fine, but the Polyps retreated into the rock soon after I introduced it into my tank. I also had a Christmas Tree coral, which was AWESOME, but that pooped tha bed too a few days after I put it in my tank. I was cycling my tank when I ordered the stuff, so when they arrived, I put them in my friends tank for about 6 weeks until I thought it was ok to bring them home. I will definitely be getting another Christmas Tree coral though.