Collare (Pakistan) Butterflyfish Reef Safe?

I have mine for about 6/7 months. At first it was nipping SPS, but I feed heavily so now only occasionally.
 
I have two in a large mixed reef system. I'm going to need to remove them. They will occasionally nip at SPS, but haven't caused any noticeable tissue. HOWEVER, they have taken a liking to LPS and are quickly munching through Euphyllia (I'm losing 2-3 heads a week) and any other fleshy colonies they can find.

They are being fed 3 times a day (2x frozen 1x live brine or live mysis) and eating from all feeds. They will eat Reef Frenzy out of my hand. They definitely need to be fed often.
 
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