I've had this clownfish about 2 weeks. He went through a week in qt when I noticed he was struggling to stay afloat and would sink easily, like maybe an issue with it's swim bladder. He would breathe heavily and his gills looked puffed out and wouldn't eat much. Now he just lays on the bottom of the tank breathing heavily. Someone mentioned it might be flukes so I freshwater dipped him and put him back in the qt tank with fresh saltwater and treated with copper. Anything else I should do?