Hmmm, idk, ive never seen that before. Leaves look really shiney and super dark green at the bottom only?? Is that right? New growth looks good, looks like its moving along well, light green tops where its growing quickly i see. Im guessin its still ffof soil. Did you add in a tea, seaweed, or fish emultion at some point? What is the ph of your water to start?
Personally i think phing water is a bunch of guano. Ive never used a drop of ph up/down. Outta the tap mines 6 though, but ive got friends that dont do it either. I only know one person that does it but his rez is like 1000 gallons. If your waters reasonable then id say learning the basics are more important than phing. If you can get a couple from seed to smoke and they turn out well then id start tweeking stuff. Ph(maybe), feeding ppms, size of plants at switch, soil, nutrients and additives, organic/inorganic, hanging time, curing time, tricomb clarity/amber at chop, all that stuff can make it better or worse. Honestly i belive phing is a fools errand and usually the go to response from your local grow store. Have you heard this before? "Yup, sounds like you got lock out caused by your ph being off", then hell try and sell you some ph up/down, some clearex to get the salt out, and some ph perfect nutes.....all hes really saying is i dont have a feking clue whats wrong with your plant, give me all your money
you may have a deficiancy or it may be normal, leaves die, its not the end of the world, or it could be an overage from somthing you added that is really high in one of the NPK values.