I have 2 boys, had one for about 2 years(Approx 2yrs old), and one i recently picked up about 3 months ago(Approx 1yr old). Tried to bond them, seemed okay at first, then they started to get more aggressive, so we stopped. They have been living separated but close for most of their time together, obviously. They seem to CONSTANTLY be trying to interact between the bars of the cage, always touching noses, trying to groom through the bars, and popcorning away as they run to take a nap. Is that normal for an unbonded pair, or is it worth trying later? Additionally, My eldest has abnormal breathing that we are trying to manage constatly(Been to at least 4 vets, and are working to solve) I understand the severity of his issues.. do you think that could be causing added tension between them as he seems to be the more irritable boy?