leaf tips turning light green and drying out

im in my 4th week of flower right now and im having a problem with some of the leaves turning a lighter colour green and some (not many) are curling up on the ends and getting grey and dry. I noticed this starting to happen in week 2 so i flushed the plants with a ph of 6.2 and i gave it a week and nothing really happened so i thought cal/mag deficiency so ive been using that for a week and a half now and things dont look to be getting better. just wondering if anyone could help?

im using general hydroponics 3 part micro/grow/bloom with big bud and B52 from advanced nutrients. i just stopped with the big bud(as per manufacturers instructions). I'm growing in soil in a drain to waist setup.


Thanks

The curled up leaves usually means you burnt them need a pic and what ppm was you feeding and was every other watering plain water this is a must

DannyBlaze2 said:

The curled up leaves usually means you burnt them need a pic and what ppm was you feeding and was every other watering plain water this is a must

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ya ive been feeding every saturday and watering every other day or two, as needed (usually once the top inch is dried).i use reverse osmosis water thats why i thought it was cal/mag issue. On feeding days my ec is at 1.6-1.8 and my ppm would be around 700-900. I usually flush my plants 3 times during weeks 3-6 of flower as-well, just to get all the old salts and shit out then i let them dry for 3-4 days before the next feeding. what do u think about foliar feeding with cal/mag this far into flower?

just my opinion, i do the lift method when it comes to watering my babies i used to water every two weeks or so but always realized i had minor issues doing it like that, now that i do the lift method i seem to fix all those minor mistakes. good luck!