Can Anyone guess what this is?

I have a pretty good idea but I want to see what others come up with first.

Nute burn!

If it's clone , it's normal for that lower leaf to die off. Hell any plant that crap would eventually die .
If it was mine I wouldn't give it a second thought. The new growth looks fine.

See that's what I was thinking at first, but could similar damage be caused by fungas gnates?

What are "leaves", Alex.

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ITs either from overwatering at one time or wind burn

Newer growth is getting it as well, not all damage is on out side of leafs. Some leafs also a little limp.

Shit weed.

If new growth is getting it, you need to add calmag. sativas always need extra calmag especially if thats an OG. But the picture is a little blurry. Best of luck.


Also, start the calmag on 50% of what the bottle says, 2nd feed you can do 100%