early nutrient use

im in my seeding stage where each seed has sprouted above the soil. When can i start using nutrients. I have a liquid nutrient concentrate ↲↲
3-1-5. Is this a good quality. Its earth juice product called sugar peak vegetative.

Most things I see point to 1/2 str until they're about 2 weeks old. I give mine 1/4 str until they get the 3rd set of leaves then give them everything, they like it.