My copper band butterfly so far hasn't bothered anything, but he's new, so time will tell. Only eats the very smallest of aiptasia, but that might change as he gets older.
If you can get one that is for sure eating, and are willing to go the extra mile to make sure their nutrition needs are met, they're easily my favourite fish from a personality point of view. They're like that awkward, geeky kid from a tween movie that you both laugh at, but are secretly rooting for. Low long term survival rate though.
I'm also a big fan of doliatus rabbitfish. They put tangs to shame in the algae eating department, and under the right lights they're spectacular. Just watch out for the poisonous spines. Mine may or may not be responsible for the slow demise of an elegance coral, or he might just be opportunistically nipping at one that is dying anyway, but he leaves all the other corals alone.
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