When should i start using nutes?

These are my white widow from ghs both have been under 200w cfl(18/6) for about 10 days now soil is bio-bizz all mix. I have bio-grow and was just wonderin when i should start feeding them:weed:
when a plant has established a good root structure. then start feeding 1/4 to 1/2 strength and work up to full strength.
 
Just started a journal with these its in the cfl section under 2 grow 1 journal if yous want to check it out
and thanks 4 the help everyone!!
 
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