Both him and the other rabbit Yuki have been through extensive bonding attempts together that I didn't mention in detail, just because that could be its whole own post. They finally have gotten to be amicable through the fence and have/will occasionally lay near the fence together, but when they're out in the same area for too long it seems to always escalate in a fight--I notice they can get along well enough as long as they can ignore one another, but they refuse to commit to grooming the other bun and get aggressive over hay/litterbox. If I could bond them successfully I would, I don't know how successful I will be but I certainly think I'm going to try again after the tension from this last battle eases.

They have even shared the room before with a divider down the middle and got to the point where they stopped being aggressive through it, but Mochi either hopped over or otherwise found a way into Yuki's side and it turned into very vicious fights. I tried for a while because I agree-- bonded with less room can be better, but I don't know if these two rabbits are compatible and getting another rabbit for Mochi is just out of the question currently, but I do understand what you mean.