Its really just guesses at this point,could be light burn maybe.
The one pic shows really dry soil,
Maybe you fed when there was still lots of food in the soil?
I dont see you turning these plants around this late in the game.
How big of pot and how long has it been in there?
My usual fix is mix...
Not enough info on feeding? A guess would be you fed them and it dried back a little too much.Fed again with no runoff allowing it to build up even more.
Just a guess.
,Its kinda tricky feeding soil that has food already like FF.
For future grows go with an inert medium and just feed nutes to...
I run a window one in the bedroom, sure helps.
Ive had this portable unit for awhile,didnt realize it would work so well in the garage.I may never leave ha.
I ve done both,topping to get 30 colas and not so much and get 15 colas.
15 was much more open allowing light to reach deeper.
Pending on strain also.
With HPS lighting for me a stadium style canopy worked well.
I dont think adding will solve it if its being blocked by excess Ca.
Not really sure but there are a lot of KNF people in the organic section.
Or perhaps add KNF to the title .