Thanks everyone for your responses. Where I was going with this was I planned to do a majority of vegging in a separate room while the flowering was finishing up. I had planned to start my clones in the small cubes and transfer them into the 6" ones. From there, I would move them to the flowering room onto a mat with ebb and flow. I think now I will stick with 6" rockwool, veg to about 8", move to the flower room, cover with hydroton, veg another week and then flower. The only thing I am concerned about with the 6" rockwool cubes is mold. Should I decrease the # of cycles per day to account for the excess moisture the 6" cubes hold?