This is also something I was wondering about. I do clones/seeds same way...start seedlings in rockwool cubes, then but the rooted seedling still in the rockwool cube and surround it by hydrotron (clay balls same thing I guess). My current watering schedule has been 30 minutes at a time, 4 times a day. Is that too much? Too little? Bad watering interval? Any recommendations on how I should water? Also, please take into consideration that I'll be transplanting seedlings that are in rockwool that are almost at 3 true leaves growth and I'll be planting them this weekend and I was wondering if I should adjust watering schedule throught the life of the plant or leave it the same the whole time?