Hello, i have a 20 gallon tank with mollies, guppies, a chinese algae eater and a pleco. One of my Mollies has the shivers, like when you get a bad cold, you get the chills? Well, that's what it looks like. What does that mean? All parameters are fine, weekly water changes and the temp stays at 80. Can fish catch a cold? Weird? I watch her shiver and I can't think of anything to do to help her. Any advice would be appreciated. Thanx in advance..........felisha