I am trying worm dirt at this very time. So far, so good. The plant is only 3 weeks old so it is about 5 inches tall and very bushy.
Worm castings are great. MJ loves it -- very mild, can be used as a soil amendment or steeped to make a fertilizer tea. I recommend no more than 20% of your soil mix.
Would steeped fertilizer tea work well with a DWC setup; and would you need to add more nutes as well?
you should use a good high quality hydroponic set of nutes as recomended and supplement with worm tea keeping an eye on your ppms...most people like to grow at 1500 - 2500 but i stay closer to 1500 ppm when im growing with water...