I have been owning the flame angel since I got into this saltwater hobby. In my experience and as everybody knows, there is a miss and hit about them, no guarantees. The one I am having right now has never touched any corals, but extremely bully with any fish, especially if they have a smaller size than him. And as I have learned so far, this fish should be the last one introduced into your tank. About feeding, I feed twice a day, I don't like to torture my fish
and when they are full they will leave your corals alone.