I have a flame angel and he's a bit of a bear. Bugs my coral and sometimes is aggressive towards my other fish. This is in a 55 gallon. All fish are different though so you could have better luck. I doubt know for sure but I believe the coral beauty or the cherub would be a better option. This would be especially true where you have firefish which are very peaceful. Once the angel is comfortable you might have problems. The cherub is the smallest and I think is a pretty peaceful fish.