I need help with my boyfriend's fish. Originally he had a bit of sunken belly and what looked like an anchor worm so I treated with clout. After that he developed a white cloudy look to his head area and his eyes clouded up, he couldn't see. So I treated with stress coat and melafix. That worked great except he was still really thin. I tried food with metronidizole to kill any internal parasites which didn't seem to help. He's really gotten skinny, tried general cure as a last ditch effort. I haven't been able to find someone to help so I feel stuck. I've tried everything possible and now think maybe he was treated with too much. I just did a 90% water change and stress coat. I really need help or I'm going to lose this fish. Thank you in advance.