Tbh nipping isn't always down to luck. I've seen plenty of people report nipping from angels and it can be traced to them under feeding due to higher than wanted phosphate levels. I'm not saying this is always the case but whenever I have seen fat and happy fish in a system, nipping has been less likely.
angels also constantly pick at the Rock work and some of this may be misconstrued as eating corals. Obviously sometimes they take chunks out of them but then you just need to be more careful what you add. I had a bicolor which isn't the best angel for a reef, probably the worst actually, and it only ever picked at favias. So I got rid of the favias. Some fish are worth it.
I'll take the risk. So far I've been lucky through the years. Besides the above about them being well fed I've also read that being sure they are used to other foods first increases the odds of success. I have NO idea if there is any real merit in that, other than the Flame has always been one of my first additions and before I started adding frags, so "maybe" that helped. Love those Flames though!!! I'd go FOWLR I think before I'd give up having one. My wife might nix that idea, but.....
