Well you may have read my thread of "Bad Idea Getting Barbs" well first off I learned that there is no such thing as a perfect tankmate for stingrays. Well Angel my motoro stingray has a bite mark one on the end of the disc which is pretty much red and a small tiny chunk of his disc is missing. Should I just add aquarium salt and do the foloowing: "Add 1 rounded tablespoon for every 5 U.S. gallons of aquarium water"? Just checking because some people put half of other medications for rays. Thanks