Gainesvillegreen: thank you for the info- i will stop the flood from reaching the rockwool cubes immediately

laidzeppelin: I just don't believe theres a good air/water ratio with rockwool... I know it can if you moisten it correctly, but I think that it tends to want get soggy, would be too hard for me to time the flood correctly to get JUST the right moisture in the cube, so not watering the cube at all seems like a better solution