blackback butterfly in a 65?

They get 6" so I think a bigger tang is in order. They will also dessimate your coral, have decided to go fish only?
 
Should be fine, as long as you don't have corals or u keep it well fed. I have one in my 180 and it used to pick at the few corals I have. If I feed it 2-3 times per day it leaves the corals alone...
 
A 65g is too small. I'd say a 75g is the minimum size for this fish, but minimal standards aren't sufficient for me. I like to see my fish in more comfortable homes.
 
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