Okay, so this is my first freshwater fish tank. I currently have 1 male silver lyretail molly, 1 female creamesicle lyretail molly, 1 male sunburst platy, 1 female sunburst mickey mouse platy, 2 albino cory catfish and 2 female guppies. (30 gal tank). The thing is, 4 of my fish are now VISIBLY...