he was fine a two days ago.. but yesterday he developed a mucus-like covering around his eye and went to the top of the tank. I added some salt, and he seemed to like it, whenever i put in a little bit of salt, the mucus seemed to receede, so i added some last night. This morning i woke up and found that the mucus had come back, should i up the salt treatment? Or can anyone reccomend a better way to get rid of the mucus?