Wow poor thing, I can't say it will ever be 100% but keeping it on a varied diet with 24/7 clean water will help it begin to heal. So sorry, what happened to it?
Go S. Vettel #1 rb8

One of my female motoros was damaged pretty bad from one of the males in the tank, and she has healed, but it took ALOT of time for it to _fully_ cure, and the pattern where she had the wounds, is not how they were, insted of 1 big spot, there grew alot of small once insted. Im not really sure that ray is a hystrix btw.