Am I just in denial?

I recently took out one of my axolotls I rescued last month from his tub. He hurt his foot from either the old substrate or his tank make bit him.

I put a tank divider between them to see how they act. Because I'm really worried toothless was bit. And as he was swimming by I saw the other lunge at him. I've only seen it once but it could happen again, and I'd hate for one to get hurt. I fed them both yesterday and offered some worm today. Am I just I'm denial that they can get along? Should I re-home one? :(

I'm thinking I'll put toothless back in the tub just to be safe.