Need some help with discoloration (Pics)

Hey guys i am starting my first thread and I am also conducting my first grow.

I am having some issues with discoloration on some of the leaves. The pics should show what I mean. Potting with Happy Frog.

I am wondering at what point should I add nutrients and since I have a hydro store in my town I have access to all major brands. My local hydro shop also produces a tea and I'm wondering if I could use that if I choose to go a more organic path???

If a well seasoned indoor grower could give me some pointers I'm all eyes.
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some of them look rather normal, might be something in the soil. Maybe check the ph balance of the soil could be that the water your using has too much chlorine.

That looks like Mag deficiency to me.
http://www.drugs-forum.com/growfaq/1382.htm

Thanks for your reply's fellas.

With more new leaves coming in each day is it time to start a nutrient solution at low strength as the cotyledons have yellowed up on both plants.

Pointers please!!