I have been thinking about getting royal grammas for my 210 tank since people suggested them. Although i am wondering how many i can keep, im thinking 2-4? Or will more of them spread the aggression? Also, im not sure what to do with them when they are in the quarantine, since in small spaces i know they can get quite aggressive with eachother. I have a few quarantine tanks, but im using one for some anthias. Should i just put them together or will they kill eachother?