I am going to be bringing a stray cat into my home. I've taken him to the vet and had him tested for disease and also had him neutered. I have 5 other cats in my home. What would be the best way to introduce him to my other cats? Also he is very friendly, but has a tendency to bite hard after I've been petting him for a few minutes. Is there anything I can do? Should I be concerned that maybe this will be a problem that he will always have? I really want him to be as happy as possible so any assistance would be greatly appreciated.