I agree with whulkamania, I don't see this as an overwatering problem. If it was overwatering in a container then the most likely problem would be root rot. Overwatering is only an issue if the water stays in the container or is leaching too many nutrients. Otherwise how would people grow hydro? If he is watering every day with a nutrient solution it I think that the most likely culprit N2 overdose. Look at how dark greenand large the foilage is and the drooping leaves. Not to be a nerd but check page 249 of the Cervantes Medical Grow bible and the symptoms the hulk is describing is a textbook (literally) N2 toxicity. To correct "flush a minimum of three times the volume of water as the volume of the growing medium. Do not add more fertilizer that contains nitrogen for one week so that the excess nitrogen in the foilage can be used" Hope that helped.