Something else I forgot to mention. Watering right now x4 per day for 10 minutes at a time. The bottom of the rockwool cubes should be JUST touching the water level when the flood table is fully flooded. The other thing is that, they have been on a 8:00AM to 12:00AM light rotation and lights went off at 12:00AM 4/05/2009 and will be on at 5:00PM 4/05/2009 for the first start to their 18/6 rotation during the night. I have done it this way due to the summer looming ahead.