Here's an update!!! About 6:00 p.m. last night the black molly was swimming vertical, like it couldn't get control of itself. I figured that was the beginning of the end. As I was watching it, I noticed tiny white spots on his stomach and along his gills. I went back through all the posts I could find, and figured it might be ich. So, being desperate, (and maybe not too bright), I started to do the salt treatment. Throughout the night, I added salt and water to the system to bring it up to 2 tsp per gallon. I also brought the heat up gradually to about 80 F. As of 5:40 this morning my black molly was swimming around normally, and even ate a little!! Now, I know I'm not out of the woods, but is this a good sign, or sign of impending doom? Also, do I need to do this for just 7 days or should I do it longer? Again, I am so grateful for all the help!!!!!!!