The roots are starting to grow into the nutrient water that is being aerated using a small air pump that pumps air through a hose, through an aerating stone at the bottom of this 30 gallon tub. The clips on the side are keeping the lid on, otherwise, the pressure and weight of all that water would bowl out the tub and pop the lid off. At the moment, it is totally dark in there, retarding any algal growth inside the water. This lettuce was developed at the University of Hawaii but the stalk is rather thin and not hearty at all. It may because of the reduced light on my front porch, resulting in a spindly stem. I'm going to try another kind of lettuce next time.
I already clipped some lettuce leaves for a salad. Niiiice!