I am afraid I don't have enough room to pull off side by side long term as I can only fit one 2x5, plus every time I had guinea pigs living together but separated, one of them was very destructive and trying to get to the other, chewing up fleece liners, trying to jump over and all the bars had to be covered by smaller bars so he couldn't chew. And considering that a non-aggressive baby stressed him out so much he stopped eating, I don't know, really. What if I get him eating, try him with another and he stops eating again? At that point I will have to rob a bank to afford the constant vet visits/dentals. He seemed much better on his own. At least he was eating then...