I had similar problem with the coloration, the plants seem to be a bit temperamental. The majority of my TDs had really bright coloured lime green new growth (brighter than normal new growth on the photos and the TDs in soil) And some of the earlier growth has turned slightly yellow. This looked as though it was causing the plants to veg slowly but after a good bit of research I found out that TD is a slow starter anyway so I just continued on gently raising their nutes until the optimum dosage was reached. They seem to have recovered fully. They're tough as old boots