Sorry I'm not a hyrdo grower but I think you need to give us more information. How much nutes, exactly what kind your using to how much water. Are you using GH hydro feeding chart/schedule? Even though I don't grow hydro I definately know your ph is too high at 6.3. Should be no higher than 5.8 ph or you will have nute deficiency issues. If you do this I'm sure some expert hydro growers will be glad to give you some great advice.
like