I have 3 molly's, 2 marble and 1 white. Yesterday, i noticed that one of my molly's was laying on the gravel not doing anything. About an hour later he was laying upside down, still not doing anything. I went to bed, woke up at about 3am in the night, went down stairs and there he was dead laying upside down under a piece of driftwood. I have only had him for about a week or so. Can someone explain this to me? because he seemed normal the day before this happened. Thanks.