I would speculate that fish just as people have certain personality traits. If the shark isn't openly aggressive toward it's tank mates I wouldn't worry too much. I had balas ( yea I know too small a tank) and a red tail and a albino rainbow plus other community fish in a 29 for many years. Everyone got along fine. No tattered fins or flesh wounds. I would say just keep an eye on him and if no problems don't worry about it!
Also got lucky again as have same shark load in my 46 and so far ( knock on wood ) everyone is happy. The only rebel rousing I had was the CAE
and I got rid of him fast.