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HELP! Round brown spots on fan leaves

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EddDivinci

New member
I'm fairly new to growing and I wanted to see if you guys would help me out. I have 2 OG kush plants in veg stage and they're only on their 3rd week and I noticed small circular brown spots on one of the plants fan leaves and it seems to be spreading to other leaves now. I have them on 18hr full spec. light, in a dwc setup. I'm using foxfarm line of nutrients and following their schedule... I've been checking ppm and ph, adjusting accordingly, Temperature have been in 80s and humidity is around 50-60%. The plants look strong and healthy other then this issue. After doing a little research online, Im thinking it may be a calcium deficiency. Which i read og kush are prone too or maybe leaf septoria. Not really sure, if anybody could help me out. I would really appreciate it.
 

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No not really... the spots are crispy bout the unaffected parts of the leaf looks normal. Afew spots showed up and then eventually covered the whole leave. I know og kush strain is susceptible to Calcium deficiency.
 
A picture in more natural light would be best. Little brown spots makes me first think of calcium deficiency, potentially rust, but its really all a guess without laying eyes on the leaves.

Does it start on lower leaves, is it only the upper leaves, or is it random and everywhere?

Also Ph, what is the input Ph of the water, what is the Ph of the run-off? Calcium deficiencies tend to occur in acidic soil.
 
I haven't been spraying at all... pH is between 5.90 and 6.10. I check twice aday. It Started in the middle of the plant, now the leaves under are showing early signs of the brown spots and also the set if leaves above the initial set.
 
Better pictures
 

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Sure looks like a calcium issue to me. I know you said your following the FF feed schedule. Do you add a calicium supplement as well? Cal/mag, magic cal. There's a million out there just not positive if FF has any.
 
No i havent been using any cal supplement... Ff does have a cal/mag in there bushmaster line... But I ordered some cal/mag yesterday from amazon... I figured that might had been the issue but Itll be here tomorrow. Ill add it asap.. Hopefully the spots will stop appearing.
 
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