Need help ASAP

My big female in the middle here that looks like she was going to put out suddenly has the top leaves curling up and drying out. Plant was vigorously growing up until this point. I left the lights off a little bit longer last night because I rearranged my tent and didn't reset my timer, and woke up to the pictures attached here, curling upward and crumbling edges. The humidity is WAY LOW. that's the only thing I can think of.

LED grow 78° 28% Rh, Fox farm OF, amended with super soil and other amendments. Two other plants in the same soil, amendment and watering schedule are doing great.

I'm not expert but I think it's nutrient burn or light or heat stress? What are your ppm's?

It's important to remember in situations like this that no matter what don't panic. Don't try too many things at once that will make you continue guessing what is working or why this happened and is what im doing helping or making it worse. AND the damage has been done so we need to look towards the new growth, water uptake are some of our indicators for correction. Ill ask and throw thoughts out now..
Your RH is low, and maybe be causing the stomata to stay closed hence stressing the leaves. Raise the humidity. The outter edges look like a possible "fade" going on. Maybe Phosphorus? Or a indication of nutrient imbalance which locks out others? With a "super soil and other amendments" it's impossible to know what is going on in the soil and if anything is needed or has too much of something else.. in other words a gamble to understand whats going on at the soil level without a "test" in which you don't have time to do a soil test to possibly correct. Have you done a PH test of run off water?

I'm using recycled fox farm ocean forest and nature's living autoflower mix, I amended it with some alfalfa meal, kelp meal and worm castings.. I put about a quarter cup of each per 5 gallon pot in there.. maybe I added a bit too much to the one showing burn? Because the other two aren't burnt at all and even responded well to being fed some compost tea. Would flushing it make a difference? run off was 7.1

Androosie710 said:

I'm using recycled fox farm ocean forest and nature's living autoflower mix, I amended it with some alfalfa meal, kelp meal and worm castings.. I put about a quarter cup of each per 5 gallon pot in there.. maybe I added a bit too much to the one showing burn? Because the other two aren't burnt at all and even responded well to being fed some compost tea. Would flushing it make a difference? run off was 7.1

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The only thing that should burn would be the alfalfa.

My humidity is like 10% or less. What's you water like? Are you using pH adjuster?

PadawanWarrior said:

The only thing that should burn would be the alfalfa.

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What's weird is I put maybe less than a quarter cup each per 5 gallons of soil. I'm wondering if I should flush or what to do next.

Androosie710 said:

What's weird is I put maybe less than a quarter cup each per 5 gallons of soil. I'm wondering if I should flush or what to do next.

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I edited my post. I don't think that looks like damage from alfalfa meal. I'm curious about your water.

I've been using great value spring water gallons jugs, because my tap water has 870 mg og alkalinity per liter. I only water when the top few inches of soil is dry. No ph adjuster.

Androosie710 said:

I've been using great value spring water gallons jugs, because my tap water has 870 mg og alkalinity per liter. I only water when the top few inches of soil is dry. No ph adjuster.

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You could try flushing that one pot a little. I'd add a little citric acid if you have any to help flush it out. Molasses will work too.

And a wetting agent would be wise. Maybe you have some dry spots.