Yea my girlfriend can relate lol the undy didnt kill the panther grouper but i brought it back to the LFS so in her head it died lolThat's kind of like the frog and scorpion fable; an undy is an undy, it is his nature. There really shouldn't be much conflicting info on the undy, they are a terror, period. At 2" you are fine for the most part, but dividing a 55g will just make him more mad. I have literally seen women in tears when they witnessed what an undy did to the other fish in their tanks.