My 13'' Shovelnose Catfish was attacked by my pair of Motor stingrays which are 13 & 15'' each, I walked by my main tank and saw the both of them attacking him, he now has an open wound on his head. My quarintine tank is occupied so I had to house him in my P Reticulata fish tank. So my question is what kind of anti bac can I administer to the catfish without harming my rays. He looks pretty beat up and Ive had him for awhile & want to get get him back healthy. My Rays are well fed, any idea what provoked it?