Most butterfly fish are not reef safe which is one reason many people do not buy them. But if that is not an issue in your tank, racoon butterflies, especially those from the red sea, are excellent aiptasia eaters and have a high survival rate. The traditional "copperbands" are problematical in a variety of ways including longevity, reef safeness, and whether or not they actually eat aiptasia.
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Warmest regards,
~Steve~
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