Hi, I too run rockwool in 6-6" square pots. Am running a 110gph pump. I started of with 1hr. on 2hrs off. started experimenting around and I don't hardly feed at all when lights are out. During the time lights are on I run a little different. Half hour on then 1 and half hour off then 1 hour on 2 hours off then 1 hour on to 2 hours off till lights out and ten 2 half hour feeding with a couple hours off. I could never run full time, my girls just can't tolerate it and seems to stress them to much. I have more than a drip though. There is where the differences lie. Mine have a shallow stream and it is too much all the time.:dance: