That to me sounds like they are trying to be free swimming but still have their yolk sacks and can't quite take off yet. Give them another day or so and they should be swimming around.

This same thing happen to me I had no clue what the heck was up why some were white and others were barring I managed to let one live long enough to see that it was an albino but sadly it got killed by another con there's always next time for me but I would seperate them
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