Originally Posted by mathwhiz
I have undulate trigger currently. We used to have a niger trigger with some other fish and the niger got along well with the others we had and he was intriguing to watch, unfortunately when we moved the stress of moving the tank I believe was probably too much for him (although we did our best to take special care with the move). The undulate is beautiful to look at and has recently became more shy. He has also wiped out all previous fish (gobies, clowns, and foxfish). So far my hermit crabs and turbo snails are holding their own. We have a 55 gal. my husband likes the undulate. Is it possible to put it with a maroon clown, a puffer fish, and / or any gobies? Have you had any luck / experience doing this? I would also love to get a lawnmower blenny (used to have one and loved it) but, again, don't want to be the afternoon snack of the undulate.
If he has already killed fish, he is likely to kill any additional fish added....An Undy in a 55 is going to feel cramped, he will certainly not tolerate any other fish in a space that small.