Welcome to the forum and congratulations on your new arrivals
Robos are incredibly entertaining to watch - have yours done that thing where they run so fast on their wheel they spin all the way round it?!
I'm sure you know all this if you've researched but have you got two wheels, two sleeping areas etc and do you scatter food instead of using a food bowl? All these things, as well as always making sure you handle both and switch exercise balls (if you use them) halfway through a session to keep scents the same, will help ensure they don't fight.