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IME they are not reef safe. They love to nip at polyps and fleshy corals. As with all fish your milage will vary. I know most online places say the are not reef safe. JME
Most of the time the long nose species are considered reef safe with caution. The other butterflies will surely feed on stony coral polyps and can nip at LPS as well.
I have a copper banded butterfly in my reef and he is a model citizen. He will even eat out of my hand.
You can semi-trick difficult feeders into eating prepared by smearing a food medley onto a dead coral skeleton (preferably of Genus they are used to feeding on). Eventually they will recognize the smell and food to where it can be fed without the skeleton. This is a much longer process in weaning, but has been accomplished. As with anything else, feeding a variety of foods and especially in quarantine is best in getting butterflys used to prepared. Oh yes, and depending on the butterfly it may feed on a mixture of algae, mobile invertebrates, and coral polyps or just dine or coral polyps. Most corralivores seem to consume the flesh of sps types.
I had one in my 55. I just had trouble getting mine to eat. Make sure your LFS feeds while you are there (I bought mine online). You have corals, so they may not be a good fit for your tank, they will much anemones and feather dusters.
Before you buy the CBB make your LFS feed the fish and see if it eats. If they are feeding it mysis and it is eating then make sure to get the exact same thing they are feeding it. That could help you out along the way. I got very lucky with mine. He is a pig and follows me thinking I'm going to feed him every time I walk to the tank.