Hey gang, Since this is my first DWC grow I have a question for you. I have 3 girls just 2 weeks into 12/12 light cycle using the Lucas Formula, doing so using the add back method. On 5-5 Iflipped the lights to 12/12 and also upped the PPM to about 1100 on a .5 scaled meter. This seemed a little high after a couple of days so i reduced the count to 950 to stop the burning of the leaf tips. Now I have one plant that is going a pale green and some of the leaves are yellowing. This is starting from the tips and working back into the body of the leaf leaving the veins green at first but finally yellowing completely. The other 2 plants are stuill a dark lush green but a few of the leaves on each are doing the same thing. I don't want to screw up the balance by using Cal Mag without confirmation of the def. My PH is pretty steady running at 5.8-6.0, temps are about 77 to 83 with lights on and into the upper 60's at night. I know some N def is normal in flowering but isn't it a little early for that now especially since I am keeping the LF at abouot the 950 mark?