i am not sure what is wrong with these upper leaves...4th week of flowering. i recently rid of my low EC solution and replenished with fresh H20 and nutrients. i am watering every other hour, flood and drain. is this plant over watered or fertilized? i am using the van de zwaan hydro plan. the van de zwaan plan consists of parts A and B which are used the entire cycle, B is a NPK soln and A is a calcium nitrate soln. the EC is 1.4 and the pH is about 6.0, the H2O might be a little cold.