Hi Tiny,
Thanks for that information! I have the water level high enough so that it is soaking the bottom of the rockwool (the clone was sitting in a rockwool cube which I placed on a shallow bed of hydroton). I stuck my finger down there and it is wet. I have 2 bubble stones in each bucket so plenty of bubbles are hitting the bottom of the net pot. Once I see roots, I'll lower the water level so they are just brushing the roots.
I'll post up some updated pics in about 3 hours :-)