I tried one a while back to see if it might snack on my friggin' Majanos... it didn't make it... 
They seem real timid, so I would make sure it doesn't get bullied too much like mine did. As for risk to corals - well is there really any hard and fast rules when it comes to Butterfly's?
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135G Mixed Reef. Bullet 2, 25 gal refugium, 2 X250W MH + 4X 96W PC\'s, DIY Calcium Reactor, Coralife 1/6 HP Chiller, Phosban, Tunze, 2 closed loops & SQWD\'s, Seios, Coralife 4 stage RO/DI & a bunch of other expensive gadgets... I may never retire, but I'm gonnahavahelluvanaquarium!
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