Need advice with Motoro rays

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I noticed that my female's disk is injured in front. It does not look like a bite mark, looks more like a heater burn. Strange, because heater is protected, but who knows?
My question would be how much salt shoud (maybe there's no need to) I put in? Would a suggested amount of salt have any affect on other fish (Aro, SD)?
 
I would keep an eye on tank mates to see who might have caused the mark.

Best thing for a small wound is clean water salt really isn't needed IMO
 
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