Over time I have had 5 mollies. Out of my first 4 (months ago), 3 died randomly, and the 4th got stuck behind some filter media I was storing at the time in the tank. I lost my 5th molly during the night (got him a while after my first mollies died). My first question is, are they generally not very hardy or did I just get unlucky? My water has always been 0, 0, 10 since before I even got them. They came from a freshwater environment, so I kept them freshwater at home. My black molly had fry, I saved 5, all died but my guppy fry are growing strong, have been living in the same conditions the whole time as well! My second question. When my silver molly died, I noticed that he got 4 dark lines going vertically up his side. Whe I took my orange molly out this mornign, he had 4 red lines up his side too. What is this, and why would it happen? Silver molly had all his lines just before he died, and the orange one had one before he died, but the other 3 appeared after. I just want to get to the bottom of it really. I don't think I'll be getting mollies again, but I like to know what happened to learn!