My wild caught male p. pulcher has bilateral eye enlargement with the right eye being cloudy. The female pulcher is not affected, nor are any of the other fish in the 60 gallon tank. Ammonia and nitrite levels are zero. Nitrate is 5-10 ppm. I ordered antibiotic that will arrive Wednesday. My question is whether to treat the entire tank with antibiotics or to sequester the fish and treat him in the quarantine tank? Should I add salt to the water? I tried to get a picture of the fish, but he is almost always hiding. This has been his behavior since he arrived in early October. Thank you.