they are propably fighting over teritory

People do say that male guinea pigs shouldnt be housed together. To a certain extent, this is true, on the other hand, i know a lot of people who have male guineas living together just fine. They are almost certainly fighting for dominance, and although it doesnt sound very nice when they squeal and wheak, its perfectly natural. My guineas used to fight for about 2 weeks untill they finally settled down, Maggie, whos now the dominant one has a few chunks out of her ears, but this doesnt hurt them too much. Dont seperate them, because they will just have to establish the pecking order all over again. However its important when to know eanough is eanough. If they engage in a real fight, in which case all you will see is a mass of fur rolling around the floor. DO NOT put your hand in to pick one out, guinea pigs will bite almost anything when in attack mode. Throw a towel over them to discourage them and put a dustpan and brush between them to seperate them ans to save your fingers. This will stop the fight and you can then remove them. If all else fails "piggies who bathe together, stay together" Put your guineas in a few cm-an inch of water and bath them with the same small animal shampoo. They will be scared and run to each other for support, they will also smell the same and so the socialisation process can start again and hopefully rn a lot smoother. Also empty out their cage, spray everything with disinfectant to remove any scent of either pig. The feed bowl, water bottle, toys, everything. If all this fails, then their just not compatable. Hope this helps

Yeah, they are fighting for dominance. I had a friend who had two female guinea pigs who would do the same for a while. They should get used to eachother eventually.