Rock beauty angelfish

[Darbell43]

I posted this in the new members section by accident so I need advice. I bought a rock beauty angelfish from my lfs(the guy that owns the store is really cool l've known him for about 5 years now) and I'm wanting to know how long should I keep this fish in quarantine? I read on a website that this fish shouldn't be quarantined for a long period of time because they are a delicate angel but I'm gonna be cautious, it also said that she needs to introduced first. She is in great condition and eats everything i offer her, I mean everything. I got three other fish in the display , they have been in there for a while now. I thinking that maybe I should take them out and put them in quarantine for a week, rearrange the rock and release the rock angel in the display so she can be alone and get ajusted. Just a thought if I shouldn't do this please let me know. Other fish are Niger trigger( he ate my damsels but very peaceful), coral beauty angel( docile) and a yellow tang (shows mild aggression only to the trigger).