Best Time to Start Feeding Nutes???

I have two seedlings, They just finished week one today, and have started their second set of tiny leafs. When should I start feeding them nutes? And what is the best brand for little cost?

---ANY HELP IS GREATLY APPRECIATED!---

theres a bunch of different companies out there, i use foxfarm and i usually start out half strength at week 3 or so.

start feeding your little beast at around the 4th internode, and only introduce a diluted strength in first week of administration. As for product, I live in South America, I don't know about all that miracle crap that seems popular north side. I've found good hydroponic food anyway, now just need a medium

i start at week 2 1\4 dose but thats me

around 2-3 weeks, when the little round leaves (cotyledons or "seed leaves") start to turn yellow and shrivel up..thats when you should start feeding at 1/3 strength. I personally love the Roots Organic nutrient line..but ive used fox farm trio before with great results.

Thanks guys for the information, I really appreciate it all!