The one plant looks like crap. Not sure if it is a pH imbalance that it is sensitive to or maybe the hydro stone wasn't rinsed enough as this one seedling had a white powdery residue on it's leaves and it seems to be struggling compared to the other seedling. I have checked the pH and it is now 6.0 and will maintain this for a week to see if it is a pH problem or not. The other plant is doing very well as can be seen in the pictures.