Our plants have gotten so big that we had to raise the light on the system because the tops of the plants started to get wrinkled and burned. Also one of the plants started to just randomly die. A picture of it is below. The roots of the plant have hit the water and the emitter for that plant is still working so we know that it has plenty of water. All of the other plants look healthier than ever. So we have not been able to determine what is wrong with the plant.