Info on rockwool

Can anyone help clear up a few questions re:growing seedlings in rockwool i plan to germinate in small cube, I have 3 lowryders how long before I need to transfer them I only have 1 oxy pot set up and was wanting to know how long before I can sex them and can I keep them in the 1inch rockwool until then ? Can I keep them in a tray with water and some mild nuts until then? Any assistance appreciated
 
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