She poops on white but mostly on brown

I think my molly fish was/is pregnant I didn't have time to get a breeder box so I decided to make one. Before I had put her in there she had given birth to one fry, but my glofish tetra ate it. Once she was in the breeder box I thought she was giving birth but instead it was this weird green...

I got 3 balloon mollies (2 female, 1 male) just over a week ago and my one female looks noticeably fatter than the rest. She is showing some signs of pregnancy but she would be my first pregnant fish and I just want to make sure.. Also the only other tank that I can set up is a 5 gallon. I have...