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He could have torn it on something. Do you have any plastic plants in your tank?
It should heal and grow back on its own. You should be concerned if you see white or greyish color around the edges of where it was torn...that means it could be infected, and in turn would need to be treated.
cool....sounds good. No plastic plants in the tank. Maybe he just a little too excited with all the pretty ladies I put in with him I'll keep an eye on him