tailspot blennies fighting

[xcross]

I bought a pair of tailspot blennies to have herbivores in my tank. They seemed fine for the first week as they settled in. However, one soon started harassing the other to the point that he may soon kill him. The dominant fish is maybe 25% bigger, which I didn't notice till I started watching them closely. He will attack whenever the little fish is in the open which is preventing him from feeding. He now has bluish white spots on his head which must be wounds. He spends all his time hiding in a hole or under an overhang on the rock. I've tried to rescue him with a net but these guys are lightning fast moving in and out of holes in the rock and I don't think I'll be successful in catching him. Any suggestions?

Chris

 

[mrwilson]

What size tank? I'm currently trying three bicolor blennies in my 200. So far so good, although it is beginning to appear that a "pair" is ok hanging out together on one side of the tank, while the odd blenny out seems to have settled in on the other side (and when he/she ventures over to that side of the tank, is often chased off by the larger of the "pair" on that side). If my tank were any smaller, I think I'd be seeing major problems, at least with respect to the third blenny.

 

[MedRed]

the bluish white spots are stress spots. Tailspot blenny's are one per tank only unless you have a really big tank.