Kinda looks like 1 of my plants when I accidently splashed nute solution on a couple of the bottom leaves.
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I was thinking that at first, but last time I did that the colors were different… but it is totally possible, its at the front of the tent
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Looks like you took the problem off the plant, if its all good tomorrow then you’ll know for sure
Naw theres a few more than that lol the first 2 pics are a different leaf
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I had them also and never found out what it was 
. Just trimmed them and it stopped occuring … 
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Yea I may just cut all the uglies off
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I’ve found this book invaluable 
Personally looks like Potassium deficiency 
But - I’ve been wrong before lol.
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How’s the environment temps and humidity numbers Iv learned that H/L VPD can have the effects of deficiencies .
My humidity has been fluctuating a bit, mainly between 45-65 with a pretty steady 26-30 celcius
@nefrella I’m almost wondering more about potassium excess, I feed pretty heavy lol it shouldn’t be hungry.
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Copy. What caught my eye was the location you stated bottom half of growth.
Could be excess.
Either way looms like nute lockout, causing excess or deficiency.
You ph right?
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I havnt checked runoff yet, ph in is typically 6.5-7 range plus ive been alternating feeding/straight water this time lol. I just cut off all the ugly bits, so I’ll see if anything comes back
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All uglies were plucked and new spots have started. Going to check runoff ph.
Edit…
Wellllllll… wtf would tank it so low lol
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I’d say it could be over feeding? Have you checked PPM of runoff?
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Well hey, that’s a win for me still, lol.
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2611 ppm? 
Nute burn for sure, flush those lillies … 
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That was my ppm meter, I’m using drops for ph.
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So after flushing all my plants the 2 that looked fine, still look fine. The sick one seems to be getting sicker by the day. The soil is still to moist to do anything wtf do i do!
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Use iron citrate.