Are you sure it won't hurt the bio?
Yeah, half dose of Mela to help it heal. Watch for a patch of white stuff to form on the wound (it would be fungus) and treat accordingly if it does. Otherwise he should heal on his own. I don't advocate increasing the temperature, as you are increasing the chance of a bacterial infection if you do.
The only time you should ever add salt as a medicative to a tank is when treating for parasites.