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Deficiency means not enough and adding cal-mag is the typical fix. Your water makes a difference too. If you're using tap water, there is usually calcium in your tap but you still may need to supplement with cal-mag. If you're using RO water, you definitely need to provide enough calcium between...

Bottom feeding once in a while helps too. Plants get a drink but you aren't wetting the top of the soil. Just remove any left over when the plant is done sucking up the feed.

Is the coco buffered? If not, you may want to buffer the new coco when you transplant. I too haven't seen many people using neem and other sprays every three days. cocoforcannabis.com and other sites have good articles on Cation Exchange and buffering coco.

Like anomalii says, it would be nice to reclaim some of that space on the bottom. 10" is pretty tight for LED light height and you'll need vertical room for the buds. Maybe swap out the current runoff system for a tray and something to elevate the pots, like wire closet shelves. I know it would...

I agree coco should not dry out and avoid straight water too. They do look hungry to me but I don't know anything about the Lucas Formula. Nutrients with NPK for veg, cal-mag and around 800 ppm should work. Have you calibrated your ph pen, just to be sure? How's your drainage and did you buffer...

I think greentips has your answer. They look dry and hungry to me. Coco has no nutrients so the plants should be fed from the start, at least a light nutrient mix. It's best to fertigate to runoff daily and never give them water only. Check out cocoforcannabis.com, good site for coco.

How much canna a and b are you using? Using the Canna feed chart for dtw?

If actual power is 250w, use 250w in this calculator. You need to know the cost per kWw in your area. https://www.growweedeasy.com/electricity-cost-calculator-for-growing-cannabis

I'll second paper bags. You can put a humidity gauge in the bag and adjust rh by closing / opening the bag,

Check out photos of K deficiency, they lookclose to your photos - https://www.growweedeasy.com/cannabis-plant-problems/potassium-deficiency

I've never tried them but they seem like a good solution.

They wor great. There are two levels and training is easy. Those green ones are from home depot and they come disassembled so they store well but I had to use twisty ties to secure the rings to the legs. Great looking plant!

yeah, you can use bamboo sticks or get plant yo-yos if you don't want to put sticks in your pots. Scrogs are great like beehive says and also check out tomato rings for your next grow. They are great for spreading branches to tie off in training. When the buds are fat the main branches just lean...

I noticed the potting soil bag lists earthworm castings, bat guano and a few other additives. Then, you added earthworm castings. Is it possible the soil is too hot for seedlings? Light soil, very little water, decent light and a slight fan breeze are the basics for healthy seedlings.

They look a little wet to me too. I would let them dry a little, but not too much. Shoot for a slightly damp medium and go real light on the waterings. IME they only need a shot glass or so (1-2 oz) and water around the drip line, away from the stem.

I'm still learning too but looks like Calcium deficiency to me. Ca is best absorbed at higher ph as well so you could try increasing ph. Your room temp is a bit high IMO too.

I would recommend getting the taller tent. You can grow with a 5' height but 6.6' gives you more options for lighting and growing style.

If you learn the basics and have good lighting and good genetics, you can hit your goal someday but I'd recommend that you confirm your lighting before setting expectations. "LED light equivalent to 600 watts and the 4x8 has 2 lights equivalent to 960 watts each..." It's the "equivalent to"...

I didn't see your groom room temp anywhere. Too cool or hot can impact yield. On fungus gnats, they are brutal on seedlings and early veg IME. Always best to get rid of them. Gnatrol or other BTI product works well and I believe the BTI is harmless. The BTI kills the larvae. Add yellow stickies...