Hi all. I'm having a hard time with my 8 month old cat. I had him since he was 2 months old and he showed signs of a "mean" cat from the start. He is a generally aggressive cat. He likes to do things his way and he scratches and bites in anger when we try to get him out of a situation like taking him off the kitchen table for example. He is aggressive with both humans and our other cat. We have slowly introduced him to our older cat who accepted him but the new cat never leaves him in peace. He jumps on him bitting and scratching, rolling on the floor both screaming with fur flying around. Both cats are males and they are fixed. The older cat has FIV and i'm worrying that the new one will get infected at some point and the other cat will get sick because of all the stress. New cat is not infected at the moment as we had him tested recently. We can never leave them in the same area unattended because the new cat will attack the older one. When he is done playing with all his toys he seeks for him everywhere in the house, he attacks him and all of this drama occurs. We tried many times to play with him until he is tired but after getting some rest he is up even meaner. We are frustrated and don't know what to do. We think about giving him for adoption but being such a difficult and aggressive cat we don't think that finding new humans for him will be possible. Any help please?