New Grower S.O.D.K Drooping and discoloration

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Problem: Bottom leaves spotted and discolored and all leaves are drooping.

Medium/grow method: Fox farm Happy frog in 5gal smart pot w added perlite

Feed: and supplements used: Advanced nutrients bloom a&b @ 1ml/liter and calmag @ 1ml/liter

water source: Tap water

Strain/age: Mephisto Sour Orange Diesel Kush at 29days from sprout

light used: 150w Quantum Board @80w and 18inches

Climate: H:78F L:75F temp, H:50% L:40% RH

Additional info: Leaves just developed the discoloration over the past 2 days and have been drooping for 3. First pic from yesterday.
 

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PH of water/feed? Amount and frequency of watering? The twisted growth has me leaning towards a calcium issue, but the why is the question. Temps are a little low, 78 to 82 optimal under led, but nothing that should cause this.

A pH check of the soil is where I'd start. FF has had issues with quality control as of the last few years, I had bags testing in the low 5s when I finally gave up on them.
 
I would start by looking at the tap water. Have you had it analyzed, or has the water supplier published an analysis. They are required to take regular water tests and make them available to the customers. You especially need to find out if the supplier is using chlorine or chloramine. Chlorine will gas off when left out in the bucket, but chloramine will not gas off and will screw with your plants. Take a pH reading of your soil to see if you possibly have a salt buildup creating lock out conditions. How old?
 
Hi bagel, I just noticed that one of your photos looks very similar to the problem that I just posted here a few minutes ago. I mostly noticed the big patches of yellow/transparent regions on one leaf and the veins looking starkly yellow in contrast to most of the leaf.
 
Have you done any soil or water pH testing? Only on the lower leaf? Nute Splash + ?
 
I got a ph meter and that definitely was an issue! Ph of water after nutes was low 5's and soil was testing at 5.5, I have since been watering at 6.5 which brought the soil up to 6 now and the plant is starting to look healthier on day 42 now. Thanks for the suggestions!
 

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