Hello from Sunnypiggie and two brothers who can't get along lol....need some advice.

Hi. So happy to be in this group. I recently adopted two brothers both about one years old from the local shelter. Their history is they came from cramped quarters with other Guinea Pigs and themselves. According to the vet report they both have wounds that have healed but there was blood and biting. The shelter told me they cannot share living arrangements. Having said that I have a Midwest cage and have added on C&C cage and have a split down the middle so they can see each other, talk, and not get to lonely. My goal however, would be to eventually have them live together. I need help. I tried having them in the playpen area together (so neutral) but there was teeth chattering and a lot of general discord. Being that they have a history I pulled them out and haven't tried it again yet until I am sure how to proceed. They both have gotten used to me and my family they seem happy in their current situation. They let me pet them and I do separate floor time and I can hold them for a bit. But the darker piggy tends to teeth chatter through the cage and sometimes at me as well on occasion. Is this normal? And any advice on how to get these brothers living together again?

Thanks.