fry that can't swim?

[LoveMyFish]

hey everyone,

Two of my platy fry can't swim upward, only around the bottom of the breeder net. They are a month old now and seem healthy otherwise. Why is this and is there anything I can do to help them? Will they grow? I could never cull them- too tenderhearted. Any suggestions?
thanks

 

[Angry_Platy]

What are you feeding them? If they are hungry, they should come to the top. That said, if the food is sinking down to their level then they really have no need to swim.

My fry on the other hand could never stop moving, they were impossible to catch at water change time.

Are they growing? If not you may need to feed them more (smaller amounts more frequently)....or perhaps they are just "chilling"