Ok here goes. Done many coco grows with no probs but this is my first time in DWC and i seem to have hit my first hurdle. Got 8 oxypots (DWC) under 2 600's nutrients i am using is canna hydro A + B Temps are always between 63 and 77 ph is always between 5.2 and 6.2 as stated on nutrient bottle. I know the above is all spot on and correct for DWC according to the many sources ive read up on before i started. If not then somebody please correct me. This leads me to think the problem lies with Nute burn or a Nitrogen deficiency. The cuts were rooted in root riots (the lazy mans rockwool) and then put in 4 inch rockwool cubes. Before I put them in the buckets they already had a well established root system in the cubes and some of the lower leaves were showing signs of yellowing. When i first put them in the buckets and under the 600's i started off with an ec of 0.5 (or 5 depending on your meter) to be on the safe side to avoid nute burn. The yellowing worsened gradually which made me rethink because an ec of 0.5 sureley wouldnt burn established cuts would it? This has led me to Nitrogen def so I upped the EC to 1.0 (or 10) last night. Should the ec be higher or lower? Are my ph ranges correct? Is there anything else it could be? Any help or advice is appreciated. If ive missed anythin off jus ask and if ive been to thorough, my bad.