Day 7: Peeled off rockwool cube as they seemed to saturate with solution from the bucket and roots would not penetrate. Roots exposed for better air supply. Expect roots to grow throughout the next 7 days and reach the solution. Covering seedling with glass when lights are off for moisture retention around leaves.
Day 9: Adjusted ventilation as temp was up to 85f; solution at 27C. Air down to 80f; solution 24C.