Thanks again for all your help guys! My girls have been in for about a week now and doing well. The roots haven't grown into the water yet, so I've been manually spraying the hydroton with nute solution. I carefully moved some of the hydroton to check the roots and their white and pearly, and hairy :-) I kind of expected the roots to be showing out the net pot by now, but I guess I just have to be patient. The bottom of the rockwool is about 3-4 inches from the bottom of the net pot, so maybe it'll take a while. I'm already liking hydro much better than soil. A hell of a lot cleaner, looks nicer..... can't wait for the explosive growth