I just fished my second Emerald (of 3) out of my 180g Reef Tank and put him in my 55g (LR and one grouper), I couldn't stand them anymore, stealing food from everybody and being like elephants in a china shop....
The hermits are terrible aswell, assasinating the poor snails and my conchs are disappearing too, from six down to 4 empty shells and two suvivors.
Oh boy do I wish I knew then what I know now.....Would have note gotten the blue legged, the emeralds, the urchins, the big mexican snails, the horse shoe and maybe not even the serpent stars....
Live and learn