I have had many angels over the past 12 years and 99% of the time they will grow very fast when another fish is trying to be dominant.As soon as they get to a certain size they start to take over and can become quite pushy.I have tryed two types of large angel fish in the last 2 years in my reef tank.The first was a juv emperor angel which was fine for about 6 months.I knew better but i thought maybe this time he/she wont be like previous times.He /she took control and its second in comand and turned just as nasty was off all my fish,the purple tang.They were neat to watch,the purple tang would be like a mirror image and even eat at the same time.They gave each other back up so they thought they were invinsable.At feeding time the angel would eat out of my hand so the purple tang started to do the same.They would not let me put any more fish in my tank.It was tag team attack.This was ok as the two of them were amazing to watch and fearless.But then my angel decided to start eating my coral for no reason at all.I took the angle out and the purple tang turned it to a shy loner with a nasty streak.The second was a regal because they are not so aggressive and can be ok in a reef tank.(they say).Anyway it just ate my coral from the moment i put it in so i have given up finaly with my lesson well learnt.Good luck to you chim i hope it turns out good as they are a amazing fish.