Hi, they are spraying to mark their territory and I guess they are about 4-5 months now? They do it because they become sexually active now and it won't stop if you will keep them together or near each other. In fact you shouldn't keep 2 males in one cage because they are no more babies and soon will start humping each other and then will start fighting, that is quite dangerous as they can seriously damage each other and even kill each other. This is natural for the rabbits you should separate them immediately and either neuter both, wait 2 months after that and then try bonding them in a neutral territory. If they will accept each other they can stay friends for life but there is also possibility that they will still hate each other so you will have to keep them separately. Your other option would be to find a good home for one of them. I adopted a young male rabbit just a couple months ago, people also got two baby brothers from a pet store and when they were about 4 months old they had a major fight it was really scary so they had to rehome one. His wounds are healed now around his eye and on his back, but he will have a huge hole in his ear for life. So this is quite serious and please separate them asap, ideally place them into different rooms so they can't see and smell each other as they will continue to spray everything around, walls, you etc.