I have 4 peppermints right now and they are cool, but they do have their downside. Mine have eaten an anenome, all my yellow polyps, and will munch on sand critters if you don't feed them enough. On the positive side, they can be neat to watch, breed once a month each (they are hermaphrodites and none of the young will live in a standard tank), and they sometimes move in a pack. If you get one, get three. They like the compnay.