That really all depends. Are you trying to ensure all fry survival? What are the other tank mates? I would personally let her drop them in the tank she is in to avoid her stress aborting, and then net out the fry and move them to a breeder box, or to a tank with water from the tank they were born in to grow out a bit until they are big enough not to be eaten. But really it is up to you as to what you want to do. Some people move the mother to breeder boxes and let them drop the fry there and some put them in seperate tanks. I just don't like to stress the prego mother since sometimes that causes fry loss. Good luck with whatever you decide though.