So I was at a LFS just a little while ago and they had a nice spotbreasted angelfish. I have a medium size coral beauty and a small hippo tang and small orange shoulder tang( little bigger than a quarter) in my 55 gallon QT tank. Would it be safe to add the angelfish in with them? The angelfish is about twice their size. They are described as being peaceful but honestly I don't know much about them other than they are reef safe.