Nutrient Guidelines

Growing in coco/perlite mix, ph of 5.5-6 range, temp of 75 average. Starting off with 18h of light (led 300w). Should nutrients be given a few weeks in or now while the seedling is still growing under light?

My rule of thumb is no nutes until 3rd node then 1/2 strength (1/4 if ff trio)

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I wait till seedling has entered veg state. As stated above. At least 2-3 nodes. I killed lots of seedlings by giving nutes too early. That young they only need water