Some are slightly larger. But there is plenty of air going across the top to keep the water oxygenated, and you can lift the box a bit to let some water out and in. Just avoid letting the mother out, because you don't want to stress her by using the net too often.
Mother fish will eat the babies too, so that's why I used the breeding box to let her drop the fry and for them to get a bit larger. If she's in a separate tank, she will probably eat her babies. I love black Mollies because they don't eat their babies. They prefer greens, but will eat regular flake food also.
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A dog, I have always said, is prose; a cat is a poem. ~Jean Burden