First Coco experience

[draxcel]

Hi to everyone,you have guide me for the basic Coco rules.I want to get a feedback.I have been feeding 350 to 450 ppm or 0.7-09 EC,phH 5,8 for my feedings those First 3-4 days with 1ml A+B Canna Coco Always run off and measure 10 to 20 ppm less than input.
My tap water Is 200 ppm
Are those babies ok to be 3 and 5 days old or I am stunting Them?
Temp 24 average and Rh 55-60%