I recommend peppermint shrimp over copperband butterfly fish, because I found out that some butterfly fish will eat aiptasia and some won't, this is true about peppermint shrimp also. But the COST of fish vs shrimp are a staggering difference. So the more fish, or shrimp you have the better you chances are on getting rid of aiptasia. I purchase five peperment shrimp about 1 1/2 weeks ago and I am very happy, almost all of my aiptasia is completely gone!!! and I was infested! Now I am down to about 5 or 6 left, and should be completely gone in another week. I am so Happy:congrats: