A little help plz

Hi guy,just getting start my first dwc grow , the seeds was pop and wating to grow abit bigger roots
I using tap water that was 250 ppm , I fought to add nuts to 400 ppm and see how they going but for my surprise when I filled the buckets its was 500 ppm so I abit confused how should I act?? Add to 600???

Tanks for help and sry about the poor English

Don't use any nutes till your seedling has 3 true leaves. emember the rule for the nutes (less is better) wish you a good luck.

Tanks for the quick answer bro