I have found mine to be very hardy as well... When I bought him the LFS had to dismantle a small display to get him out, and then we had a 2 hour drive home. Plopped him in the tank (didn't QT - had been living at the LFS for over 6 months in a small display alone) and he immediate went to cruising around picking at rocks. No adjustment period whatsoever. I recently upgraded to the 180... had to tear down the 90 and put the fish in a 55 for half a day while I moved the 90 and put the 180 in its place. All the other fish are cowering under rocks, he's just cruising around doing his thing. Again, had to move him to the new 180, all other fish are nowhere in sight, he's just swimming around like any other day. Nothing phases this fish. He's definitely my favorite in my tank. Eats any food I provide, picked at a gorg for a few days but then stopped. Picks here and there but not even enough to hinder polyp extension.