Black molly assistance needed! :)

Question
Hello! Just this evening we purchased a female black molly and she seemed to be very aggressive to the other fish. I know they are a more aggressive fish, but all the fish we purchased were all in the same tank together. Well, I noticed her swimming from one side of the front of the tank to the other at high speed! (just a few times) While doing this, we noticed a little white speck coming out of her 'anus'?....then she slowed down and this white mass popped out of her! Last time I looked another little white speck was there.  My husband placed her in the mesh breeder tank we have hanging inside the tank to keep her away from the other fish she was being aggressive at.  Do you happen to know what this white stuff is that came out of her?? Thank you for your time!
Cindy

Answer
It may be feces or it can be internal parasitic worms, if that is the case remove her from the other fish and treat the tank with a parasitic remover solution, you may have to ask the store if they carry some if they do not you can call your local veterinarian and they should be able to supply you with a chemical to help you remove them.