How can I tell he's healed?

He's been tubbed a little over a week for a hurt foot. He's had a few methylene blue baths just in case. Does his feet seem to be okay? How can I tell when it's healed enough for him to go in his tank?

I also bought a tank seporator because I'm unsure if the Injury was a bite or something in the tank scratched him up. When he is in the tank, what kind of behaviours should I look for to know weather or not the two axolotls can get along or if I'd need to rehome one? (Unfortunately I don't have enough space to set up a second tank :( both are men and are brothers as far as I'm aware)