[cypher]

I would just keep an eye on Salt & Pepper for now, a little bit of bickering & squeaking isn't unusual but watch them carefully for any signs of fighting or one becoming dominant & preventing the other from getting to food or water, if either of those happen you may well need to separate them so be prepared just in case.
If Salt has something stuck to or in his nose just watch to see if it comes away when he grooms if not then have a closer look & remove it if need be.
They are funny when they put food in the wheel lol! The noise can be really annoying though, I'm sure they know that!
Tunnels can be pretty amazing, I love those underground noises & wondering what they're up to in there!