09-01-2010, 05:16 PM
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Hello. I too have noticed the same thing. I think it may well be a matter of available space. I had some swordtail fry that I kept in a net breeder while one was swimming free. The free swimmer is now an adult, the two in the net never did seem to grow so I finally released them into the tank. Unfortunately, I never saw them again.
Currently, I have about 20 molly fry in a 5 gallon tank. Most are going to the oscar, but I do have a home for 3 of them when they get big enough. All the fry were born at the same time, but some are bigger than others. I think in the interest of surval of the fittest, the oscar will get the small fry.