Is that a general practice or just something you prefer? Why do you not separate them right away? If they are all in the same tub how do you tell which ones have shed?
It's a general practise to keep them all together, there is really no need to separate them until they have their first shed and get ready to eat.
As for knowing how to tell which one shed it's pretty easy, hatchlings that have not have their first shed are very shiny/glossy.