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Just worry about the ph of your nutrient solution.

This, supercropping, pinch and roll with your fingers until it's soft you don't want it to snap just bend.

They look like they got too hot and too dry. Too much transpiration and the leaves do that to try and slow it down.

At least it didn't malfunction and keep your lights on

How much co2 could possibly come from such a tiny bag

Are you using the hard water micros or the regular? Have you looked up the water report for your area to see how high your calcium carbonate level is? Maybe start being more precise with the sensi cal as well which contains magnesium so I don't think you should need epsom salts on top. Sensi cal...

Ideally it would be completely sealed with a heater, mini split and dehumidifier for climate control. If you have to exhaust for temps exhaust into a lung room with a dehumidifier you don't want to just exhaust out your co2 and waste it.

I use coco in little solo cups, drop seed in hole and keep it moist until it sprouts seems simple enough.

They look like they stretched a bit and need more light maybe lower your light. The lower leaves probably positioned themselves like that to get the light reflecting off the wall.

Maybe your meter is reading 1200ppm as 120ppm x10

Looks like the light could be closer and it's a male

I never used one with an active exhaust due to dry climate but I'm trying a semi-sealed closet and RH gets over 70 real quick.

I've used mine about 40 inches away. The HLG dimmed down would definitely be more efficient if your space doesn't need the heat of the CMH.

I've had one like that it never grew had to toss it.

Looks a bit too dark green, over fertilized

The lower yellow leaves say nitrogen deficiency, the purpling stems say phosphorous deficiency, the twisted leaves say calcium deficiency or maybe even too much wind from your fans. That seems like a lot of fans and a lot of light for small plants. Check to make sure your bubblers are working...

Use a toothpick to gently pick off that little bit of skin on the tip holding the cotyledons together

Ace Hardware has Hi-Yield calcium nitrate 4lbs for $8. I'm trying Jack's 12-4-16 right now in veg at 3 weeks from seed 1.2 EC then I'll use the 5-12-26 in flower.

Looks hungry, which fox farm nutrients are you using? I would try watering once a day with around 0.8 EC / 400ppm of nutrients that have the right amount of calcium and pH between 5.8-6.5

You just hand water / feed every 3 days? No runoff at all? What kind of EC/ppm do you run?