Where to put atiel chicks?

my atiels are mating and will soon lay eggs and obviousley i will have chicks. i have 2 avairies 1 with atiels in and 1 with canaries and finches in. when the chicks leave the nest i will have to sell them because they could could breed with their parents or siblings, but where will i put them when they leave the nest and before i sell them. i dont want to buy anything else if i dont have to