How do i keep my male cat from attacking my other male cat?

I have three cats, one of which is female. I have a Bengal cat, who is very active and a few years old, and he is constantly attacking my other male, who is very mellow and a little older. However, he does not attack the female. There are scabs all over the older cat's neck and I hear them fighting at least a few times a day. This has been going on for a while, but has gotten worse over time. The older cat never instigates and always minds his own business. My Bengal cat is always the one to start the fight and is almost never injured. I have tried making loud noises like clapping my hands, tried throwing a pillow near them to startle the Bengal, and physically pulling them away from each other. There's never really time for me to grab a spray bottle, and I don't think it would work because the Bengal is pretty nonplussed about nearly everything. We have three litter boxes and a few different places for them to eat and drink around the house. What should I do to prevent my Bengal from attacking the other cat?