My black molly just gave birth last week. We bought a little one gal to use as a nursery, so that the fry wouldn't be stuck in the breeding net and because we have another molly that's pregnant right now, too. I set up the tank, conditioned it using the water from the larger tank, and all the fry transitioned fine. They were swimming around, healthy and eating, for days. Now, however, only one of the fry seems to be swimming around. I know fry like to hide by burying themselves in the gravel, and when I cleaned the tank and did the water change, like six of them popped up from between the rocks. But, I also found two in the gravel that had died. Like I said, only one is swimming around and coming up for food. All the rest are staying hidden and I'm worried that they're not eating. There's too much food being left at the bottom that I have to keep cleaning out. I leave the food that's settled on the rocks over-night, in the hopes that they'll come out when it's dark to peck at it, but then I have to clean it in the morning and it doesn't seem like any of it has been eaten.