I looked up the kole tang and I got this:
"Characteristics & Compatibility: Even though the Kole Tang is one of the less aggressive Surgeonfishes, it will battle with its own kind, and possibly with close relatives. Because it is less aggressive it may also be picked on by other, more aggressive Surgeonfishes. For this reason it is best kept singly, one per tank, but it does make a good choice when it comes to compatibility with other more docile, non-related species. To reduce compatibility problems, if you decide to put this fish together it generally helps to introduced them into the aquarium at the same time. Like all Surgeonfishes, the Kole has a very sharp spur or razor by the tail. It may seem small, but it can inflict a pretty nasty cut. Therefore, use caution when handling this fish. When attacking other fish, they extend the spine near their tail and attempt to slash the other fish with it. Hence the common family name of Surgeonfish."
Thats scary lol. With the mean damsel all he did was bite their tails, so what would I do if I got one of these and he hurt my other fish? Is he more likely not to get along with my other inhabitant because he is new? Is there a special way to introduce a new fish? I got all my others at the same time, so I am a little worried.