Is your rabbit neutered? Is he an inside rabbit? Is he kept into a cage and for how long everyday? ? Neutered rabbits having a lot of time outside their cage and things to occupy themselves (carboard boxes, cisal mats, safe tree branches to nibble on...) are seldom agressive. Often, rabbits perceived as aggressive are territorial and they are only defending their territory because hormones tell them to do so and they have nothing better to do. We need more details to help you, but know that if your rabbit is not desexed you probably will have trouble solving your problems if you can't have him operated.