I’m growing Girl Scout Cookies Extreme under a 600 watt LED about 3 feet away from them. I’m using FoxFarm Ocean Forest soil and FoxFarm trio fertilizer with Botanicare Cal-Mag plus. My ph has been stable at 6.3 and my ppm (500 scale) is about 900 with my most recent feeding. I think it’s a calcium deficiency, but I’m still new to this, so I’d really appreciate if someone could confirm what’s exactly wrong
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It’s unlikely that you have any deficiencies if the pH is in line and you are feeding the Trio and a cal/mag product with a reasonable PPM. Blemishes are common, particularly if it is among the lower leaves on the plant. Can you post a pic of the whole plant.
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that’s a considerably distance to the canopy. How many are under this light Growmie 
Been spraying anything?
I’ll have to take a picture later today when the light turns back on, but I’m pretty sure the top leaves are kinda light green compared to the rest of the plants
Five plants. Is that really too far? I had them closer on my first grow, but was told that it should be higher
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No sprays, just liquid nutrients so far
What’s the size of your Grow space? That light will flower 1 plant Growmie. Post some pics of your set up
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I will definitely post some pics as soon as possible. My tent is 5x5 and I’m using the Mars Hydro FC-8000, but I’m only running it at 600 watts because of the temperature. Is it seriously only meant to flower one plant though? I ran four plants on my last batch, but I also had a lot of problems on that grow
Nice! I thought you were running a single 600 
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5 plants in a 5 x 5 is a nice count. What’s your training plans. I’m a fan of topping and LST, there’s several ways to help with plant management and yield increase. A lot of great cultivators here in the community using different methods. @kaptain3d i believe has a similar light or maybe this one and can help with that
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Flip the leaves over and break out a loupe or magnifying glass. On first glance it appears to be mites or some other critters.
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@Yuniku i have a couple of the fc6500s they are beasts the 8000 is a monster 
I found this 
on the 6500 it shows where you are at different % and distances the 8000 has more balls but this should help a little
As for your leaf damage… it looks like bugs to me
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Damn, that was my bad, should’ve been more specific about my light. As for training, just LST and scrog at this point, but I did FIM my last grow. It didn’t turn out the best though and then I started seeing a lot of people saying you shouldn’t FIM or top autos, but I’ve also seen quite a bit say you can, so honestly just testing shit out at this point. I definitely want to Super-Crop some autos at some point though
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I looked at it and I couldn’t find any little critters, but this is what the bottom of the leaf looks like
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Oooo, that’ very helpful. Thank you! I looked at it and couldn’t find any bugs, but I could’ve missed them maybe
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Plant looks fine. Don’t worry about the lower leaves. It’s normal for them do develop blemishes, yellow, and eventually fall off as the plant matures.
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Very nice news! Thank you so much, dawg
It some kind of bugs, look all over the plant, and go get some captain jacks Insecticidal soap, spray when lights are off. I wouldn’t ignore it as it can get out of hand quick. Some bugs are only seen at like 40x magnification.
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