Well I had an aptasia problem about a week ago. i bought some live rock from a local and when I got it in my tank, I noticed about 4 - 5 aptasia's on randomly on it. I asked around and was told Peppermint Shrimp will eat it. Well, I bought 2 of the shrimp, let them loose and they soon executed each aptasia one at a time and they were all gone in about a week. I love Peppermint Shrimp.