Hi! Thank you so much for replying
I also thought that 15 weeks (~3 months) is too soon/they are too young to really be suffering from hormonal aggression - I know they're sort of in the equivalent of their preteens/early teens now.
I'd like to avoid any sort of operation really as we only have one slightly rat-savvy vet who works part-time! 😬
This is my first time with male rats - do you find buck grease is a problem?
Hopefully, as long as there are no injuries and I keep an eye out they will establish a pecking order and settle down a bit!