I have had great success growing salad/lettuce in DWC. The plants have a constant water supply. I did a Soil/Hydro DWC Hybrid under CFLs and there was more salad than I could eat. I started the
seeds in a Jiffy Pot with a Soil/Pro Mix mixture. When the roots started to come out of the bottom I put the Jiffys in the DWC.
I like the clean set up of your DWC system. Nice job on the reflective top too. That looks like a solid system. I'm excited to see how big the leaves get. Thanks for the pictures!