I added a group (3) of yellow tangs to my 125 gal (6ft) fowlr (future reef) tank at the same time. A week into it one became really agressive towards the other two. 3 days after the aggression started I moved the agressive one into my 20 gal refugium. Should I try to reintroduce it later? The other two are getting along well. If so how long should I wait? Anyone with experience chime in. The only other fish is a blue hippo tang that is larger and an awesome fish.