Hello, I woke up this am and both my fancy goldfish seem to be sick. I think they have fungus. They seem to have a white slime like on their bodies. I did a filter change 3 days ago so I'm wondering how in the world this could have happened. I took them out of the tank and put them in a hospital tank and have been changing the water out for a bit. I used a lifegusrd tablet as that was the only thing I had. My big guy seems to be snapping out of it, but my little guy is floating upside down but still breathing. PLEASE HELP!