Some Yellow Spots

[Glanza]

Anybody has an idea what could it be? i thought of cal deficiency bt could it be humidity issues? i am running aircon over humidity controler to 49%. 1st pic is that plant.

Second is another plant whereby leaves show signs of posible necrosis. any idea? soil ph is 7.2

 

[jipp]

almost looks like you burnt them.. but i just guessing..
but if it was burn why would it be in the veins. shrugs.. i burnt my tip and it was a spot not like your picture.. but same effect in teh end.. dead plant matter.

hope others come along with better info. any pictures of the plant?
what is your environment? soil, hdryo? lights etc.. it will help others diagnose the issue at hand. more info better advice you will get.
chirs.

 

[Glanza]

The plants are in 50 50 perlite n peat moss mix in 10L bags. i knw 10l is small but i cant go bigger.

Lights 12hr
2 600w hps and 1 250w mh

Yeah the 2 plants showing necrosis got high ppm 1800 once during veg. but since i am nt going above 900ppm.
I use hard water. my truncheon doesnt read under 200ppm
I add calmag to reach 300 to 400ppm, then nutes to reach 900ppm. n also sme aple cider vinegar to keep ph on the lower side.

I water them every 2 to 3 days as am low on humidity due to aircon and the girls get thirsty