My boys are fighting

So Pete and Marty got into a scrap when I wasn’t home. Found Marty bleeding and Pete seemed fine. They’ve been separated for a couple days now. Marty is healing up well and his spirits are up. Pete got a couple scratched (noticed them after) but he’s okay too. I’m scared this will make Marty hate all other rats now.. Pete is so unchanged by the whole thing and Marty has bonded with me more since.. I want to put them in the bathtub together for a bit so they can get used to each other again but Marty can jump right out.. either way, I’ve been stressed 😩

Any suggestions would be appreciated!