Last week my molly that I had purchased from the LPS gave birth. I could only save three of the fry. I kept them in a breeder and I noticed one fry was larger than the others, was white and was stronger. It swam around as the others sat on the bottom. They were all black. I'm not sure if they were underdeveloped, but after a week I transferred them to my cycled 10 gallon. The mother meanwhile had been acting distant and still is. She is hiding a lot still when she was normally zipping around everywhere. The babies have stayed low to the bottom of the tank. I also noticed some had strands of poop stuck to them which fell off. I was wondering how to get rid of that constipation, since it was just normal poop. Today I saw one of the little babies had died. I immediately did a 25% water change with all the fixings, stress coat, aquarium salt, and water conditioner, plus a little stress zyme. Still, the other little black one doesn't swim very well and stays on the bottom of the tank. Sometimes he'll muster the strength to swim up, but usually falls back down. His tail is always straining. I'm just wondering why one baby is striving so well, while the other is weaker. Also, what could've caused the other baby to die? This is my first batch of mollies and I really want to help them survive.