My Cardinal seems to have something wrong with him. There appears to be strings of "slime" with white spots in it coming off of him. It sometimes is attached to his body and mouth area too. It floats in the water off of his body, then when he moves it comes off and the filter gets it. He's acting normal and eating fine now. I did have a HUGE ammonia spike, but have since gotten that back under control. Any ideas what it is, and how I can cure it?