I would isolate the bully ram immediately. I have a special fish prison set up for naughty fish. Sometimes i wave it around outside the tank as a warning if I see bullying. You can leave him in prison in the same tank so he can reflect on his bad behavior. Might be better than isolating him in his own so that his tank mates can still see him.
Here's a link of what it looks like
You can do a yahoo search for fish breeder net, your LFS probably has one.
Well thats my opinion, good luck.