How long do you need to keep baby fish in a separation net?

There are about nine balloon molly babies that our fish just had and I don't know how long we should keep in a separation netHow long do you need to keep baby fish in a separation net?
till they are big enough not to fit into other fishes mouthHow long do you need to keep baby fish in a separation net?
You should be able to put them in the main tank once they are around 1-2cm long. Remember that good water quality will help the fry to grow faster.
You will need to keep them separated from the others until they are too large to fit in to mouth of any fish, have you got another tank? One with a sponge filter would be ideal and heater a 30 litre would do and would also act as hospital/quarantine tank.