I've had a juvenile yellow tang (3")and a pair of ocellaris fry (1 1/2")in quarantine for almost 6 weeks. I had a blue hippo tang that died after 2 days. I immediately started dosing cupramine. I kept the levels correct throughout treatment and never saw any signs of disease from the remaining fish. So after 4 weeks I put carbon in and get all of the copper out. The clowns (one much more than the other)now have decreased appetite, occasional scrapping, somewhat heavy breathing, and today I observed one clinch its pectoral fins for a few minutes on and off. The yellow tang eats like a horse and shows no abnormal behavior, spots, ect. I have been battling ammonia since almost day one and I'm not sure if this is what is causing it or something else. The ammonia has been as high as .06ppm but usually, and currently .03ppm. I have a new cycled DT if it's believed to be the ammonia but don't want to potentially introduced something. I also have paraguard on standby if needed. Thanks!!!