Im sorry but your advice is incorrect, leaf cupping is a sign of over fertilising with leaf margin burn and yellowing. I have grown for nearly 20 years and have purposely overrwatered, over fertilised and all other things (mainly with males)so as to understand before hand what is wrong with my plants. I did these experiments way before internet forums and growfaqs that help people nowadays. Im not wanting an argument I just think you are getting your facts incorrect. Have you personally had overwatered plants? Have you ever self diagnosed by removing all possible causes one at a time starting with the most probable? When you have you will know what I mean. I respect your desire to help this guy but in this case I believe you are wrong. In the pictures you can quite clearly see whole leaves that are a faded yellow and about to fall off. This along with the 'clawing' is indicative of overwatering.
