hi bayweed welcome to the forum
well im gonna have my noob diagnosis and say its ph drift and nothing to worry about ............... reasons are as follows
your first post you say your ph was 5.5 and you have been lifting it up to 6.3 slowly in your next posts . im gonna take a stab and say A: you did to much of a jump or b: your drifting it to quickly manually .
i had the very same browning on my leaves on my grow the now which is first time dwc (not my first grow) and it looked very very similar to yours .only 1 or 2 leaves had it rest of plant and other plants were fine in the same res .
my diary check from page page 4 post 76 :
https://www.thctalk.com/cannabis-foru...-pinkman/page4
check this out
age 2 post 37
https://www.thctalk.com/cannabis-foru...y-thread/page2
just carry on as normal and be careful with your drifting of ph would be my diagnosis .
hope this helps and good luck with your grow
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