new seedlings until the first set of true leaves need only water. In DWC, I then take them to about 200 ppm ( .285 EC ) then 2-3 weeks later go to 600-700 ppms ( .85 - 1.0 EC ). I personally keep the ppms there till the end. Some people increase the EC as high as 1.8, I don't believe its necessary. Flush a week before chop with distilled or RO water
Sorry, didn't mean to hijack your thread Steely!