when should hydro nutrients be added the the nutrient solution. 1 week, 2 weeks, right away? I know it has to be diluted quite a bit and then build up. I just dont know when to start building it up.

Check the FAQs. The information is in there.
Are the plants clones? or grown from seed?
Clones inherit their age from the mother so they can handle a stronger nutrient solution more quickly.
Seedlings shouldn't require any nutrients or only trace amounts until their forth set of true leaves.

Sounds like good advice to me

__________________
Peace
Zandor

If you go cheap you grow cheap. - Me

just to clarify four sets of true leaves. Would this be a seedling that has the two sets of leaves, coming out the side and then two more sticking out the middle in the same directions of the cotydlens (however you spell that). Or is it 4 big fan leaves, with 4 nodes? What is the normal timing for this. Im a bit confused?

anyone? anyone?

4-5 tiers, so to speak...

could you be a little more specific?

Check the FAQ's just to be sure dont wanna be doing anything wrong.

__________________