Which corals tend to grow out of control

[ed99]

I'd like to hear how to remove mushrooms as well. They are not out of control yet, but they are getting there. So if anybody here in Calgary wants some purple mushrooms, let me know!

One thing I found interesting is that while my purple mushrooms are multiplying like crazy, I had some green hairy mushrooms that withered away and died. The only thing I can think of is that they were incompatible with another softie in my tank. Also I had the same with green star polyps- instead of growing they just withered no matter where I put them in my tank.