Divided the Noodles (our 22 balloon molly fry) into two tanks tonight, 11 in each, to give them maximum room to grow. They've already doubled, possibly tripled, in size in just over a week. They eat voraciously, and get both crushed/powdered tropical flakes and thawed baby brine shrimp each day.
I'm going to have to keep an eye on Craigslist for a decent sized tank or tanks for them. Two 20 gallons would be about right, but I don't know where I'd put them. I'll figure it out though; maybe I can find one with a stand.
I'm not entirely sure I want to turn my bedroom into a balloon molly breeding factory, so I'm not certain I'll do the fry thing again on a large scale like this. But this first time is really fun, and there's no telling what the future will bring.