I am only 6 months into the hobby, so not much experience. I have a Storm Mocha clown having been quarantined for 30 days. Never signs of disease so I did not medicate. Transferred a yellow watchman goby a few days ago from same QT, and doing great. Today, a fire fish in same QT was dead and Clown under severe stress. Breathing heavy at bottom of tank. QT was cloudy, so I moved him to display tank to see if cleaner water would help, but still stressed, so moved him back to QT. Began treating with General Cure and introduced 2ml to 20 gallons to start getting copper level up. Any guidance, thoughts or comments? I am very new at this. The only thing I added to fish QT (after the goby left) was some snails from a coral QT that has been running for 40 days. That coral QT did have what I believed were pods on the glass. Now I am concerned maybe they are flukes.