We are fairly experienced owners and bonded before but are struggling!
One year old male recently lost his friend so we got a new baby. We kept them side by side where they could smell and hear each other for just over a week then put them into a neutral pen with separate hides, bowls etc. this is what we've done several times before and after a bit of chattering etc they get on fine. This time they wouldn't stop rumble strutting, chattering and chasing, mainly the bigger one instigating it. He also kept humping the baby (so much so we genuinely suspected baby was a girl-definitely a boy but his back end was rather wet afterwards so all a bit strange). The baby was getting stressed so we put them back into adjoining cages.
Any advice on next steps would be much appreciated- the older one has bonded with two others before and never had any trouble. Baby is quite shy and isn't trying to be dominant...