this is my first post here and I am here because my plants are driving me nuts. before i tell the problems I got to say that I think I have found the solution already :hubba: . thanks to all the info i found on your site on ph levels I am sure that is the problem. my girls grow great to begin with from both seed and clone but slowly show many different signs of problems from intervenal chlorosis to brown spots and burnt tips and canoeing and so on and worsen as they get older. all my efforts to mess around with my solutions have failed sometimes with drastic results. i dont know how i have overlooked this important issue of ph. i can see from the charts u have that i can fix all the issues with 1 thing. im gonna go look around the site some more, looks awesome. any other ideas or suggestions are also welcome and appreciated. I am growing hydroponically in rockwool with a 2 part dnf solution, 1000 hps kept 1-2 feet above tops. thanks for all your information and help.