But if the ppm goes up and and the ph goes up that doesn't makes sense. only if the ph goes down and ppm goes then its too much nutes. to me it just looks like your plants could use some oxygen. Not experienced with dwc. heard the plants can turn on you quickly, so i have always stuck with ebb and flow. how are you oxygenating the water? what size air stone, air pump?If the PPM goes up it means you gave the plant nutrient burn. Its drinking only water and not up taking nutes. How are your water temps.. DWC its very important to have reservoir temps 70 degrees and under.