Any alternatives to Feliway?

I'm just wondering if there is anything else that helps reduce between cat aggression? I have an order of Feliway comming, but I'm just wondering if there is anything else I can try. I ran out & the first few days were fine, but now Isaac is back to mounting Levi. Frankly, Levi doesn't like when Isaac does this and i usually leads to a small fight. No one has ever been hurt, but everytime I think I don't need the Feliway it turns out I do. Just curious to know if there's anything else out there?

Not sure if this will help; however, I read once a long time ago that if you have two cats that 'don't like each other' (which doesn't really sound exactly like your problem), buy tuna in oil, and take a little of the oil from the can and rub in on the back of each kitty. They won't be able to get their own tuna oil, but they'll smell it and groom it off each other, and hopefully in the process, will become friends.

If you try it, please report back because it does sound wacky but possible!

GL - lauren