It is iffy but is added correctly it might work. Do you have an acclimation box? If so do whatever your standard process of conditioning the fish is; I.e. quarantine, dip etc and when ready add him to the acclimation box. Keep him in it for a day or two or at the very least overnight. Longer if you can. A large acclimation box is suggested. The when you finally add him to the tank feed the tank first to potentially disperse any aggression.
There are no guarantee but this is one of the best paths to successfully adding a fish to an established system.