Alright, so my boyfriend and I have had our two boys Liv (standard) and Indy (hetero beige) for about a year now, Indy a little less than that. They got along from the start and have been living together since. Indy is a little weirdo for sure but Liv is a mellow chinnie so they balance each other out, i suppose.
On Saturday, we picked up our two new additions a little pink white and a light ebony from Mt. Zion Chins who are both about 2 1/2 months and they are both great. Obviously they are in a seperate room during quarantine, which happens to be the spare bedroom next to my bedroom where Liv and Indy have their cage. The two pairs have not seen each other or been in any contact. However, the little pink-white guy is quite a barker! He's nervous, of course, and will sometimes sit in his fleece tunnel and bark for about 5 minutes straight. Plus he's loud, so of course Liv and Indy can hear him. Liv doesn't seem to be bothered by it, but I noticed initially that Indy will make a loud squeak like he's trying to communicate with them, they have yet to respond. They do squeak to each other though (the little boys) and he may be able to hear that.
Now two nights ago, I woke up quite a few times to chasing going on in the big boys' cage. I always hear jumping and such but this was not fun. I eventually realized that Indy was chasing Liv around, causing him to fur slip a few times and run into corners or hideouts to get away. He did not physically injure him from what I can see and Liv seems to be okay when i took him out for playtime. Obviously i seperated them, but do you think there's any correspondence with the new arrivals and this sudden aggression from Indy? I know sometimes cagemates can basically attack for no reason, but I can't help but think that it has something to do with Indy knowing there's other chins in the house? I could just be crazy. I would appreciate any help though! Thanks guys.