PT's Official Law Breaker
Join Date: Jan 2003
Location: In lala land!
First question I was going to ask, was he neutered LOL but I guess you answered it.
If he doesn't like the other bunnies, he is probably feeling the need to show that he owns the place, by marking it and peeing. Can you let him have out of cage time in a room, that the other rabbits don't use? See if that makes a difference to his behavior.
Also if he does pee, you need to get the smell out asap or he will just go in that spot again.
Does he just go all over, or does he do it in the same spots each time? If he was doing it in the same spots, maybe you could try him with a litter tray out of the cage, aswell as in it.