Hi everyone I quite new to this forum and am posting from my phone but am hoping someone may be able to help. I purchase an injured fire eel from a Lfs who was keeping him in a gravel tank with no hides, trying to be a Good Samaritan he was okay for the first few nights found his own hide and swam around the tank confidently I awoke one day to him dead and notice my gar who was the same size about 12 inches had while lines around each scale and frayed fins. I bumped up the temp to 82 and did A water change and extensive tank clean the white stuff looked like he was peeling and with the added melafix seemed to be improving, unfortunately he died the next day real bummer... Now I have a 7 inch fire eel and 2 6-7 inch bichir who all look in perfect health are swimming around and ate yesterday one bichir seems a little stressed but he's a weird guy anyways.. Any ideas what it could have been?? I can post pictures if I can figure it out how lol. I have pictures of the gar when he was alive and of my whole tank. All parameters are more that good I do weekly 30% wc and have well water with no chlorine, the tank has been up and running for over a year with no illness