Hey I have a question about bacterial infections in fish and what it looks like. I have a qt tank that I usually kept a frog fish in that I will use to quarantine new fish when I get them and then move the frog fish into the sump. I got a sunburst anthia and got him eating using baby brine and then misis shrimp and he was doing great for about 2 weeks I then thought I would add a goby to my system and would just restart my Qarantine prossess...... When I put it Into my tank I noticed it brought ick with it and dosed copper Into the system. The goby died within a day and I began watching my sunburst closely. It looked like he might have had a white film on him but it was hard to tell. He stopped eating and died with little to no obvious sighns of disease on him, he seemed bloated that's the only visible sign. Fast forward a couple weeks I put the frog fish back in(not letting him get an air bubble in him) he ate fine and I didn't notice anything off but 5 days after I looked at the tank when I got off work and he was just dead. Same thing no evidence other than being bloated. Do you think that it's just a frog fish thing or is it related?? Is my tank infected with some sort of bacteria? I finished the copper treatment, should I not put any fish in this tank?