I will add that in my experience it is very hard to tell when they are going to drop the fry. I recently bought two pg mollies. They were so big they looked like they had each swallowed a large bing cherry. Still it was over three weeks before they dropped any fry. On the other hand I bought a couple of small platys some time ago and they never looked pg but continued to have fry a couple at a time over a long period.