Wow, that's interesting! My Keyhole is in the open water, like seen below, or higher even most of the time. He spends so much time at the top of the tank that it completely eliminated my urge to get chromis or something else to fill out the tank more. I don't think I've ever even seen him pick at the rocks, let alone coral, while all the other angles spend all day nipping at everything. This is my first time having one and I'd never even seen them in person prior to that, so I would have guessed they were the most reef safe based on my own anecdotal experience. Fascinating how much personalities can differ with the same type of fish. Although I'm starting to think mine might just be a little weird if they're usually the least reef safe.I tried a keyhole angel a few months ago and it was the least reef safe angel I have kept. It non stop picked at sps polyps. I don’t usually mind occasional picking but the constant picking was just too much.