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Looking good but not ready IMO. I'd keep watching for the white pistils to turn brown and shrivel into the buds. The calyxes will swell and the buds may start leaning from weight. Nice trich photos, just make sure you inspect trichomes on the calyx. Trichs on leaves mature early.

You can try raising your ph to 6.5 ish. In soil there are some nutrients that uptake best around 6.5 (Ca, Mg, P).

This link has a few ideas from GWE. https://www.growweedeasy.com/growing-cannabis-setup-examples

I see white dots on some of the leaves. Have you checked under the leaves for insects?

400-500g per/m2 is referring to the canopy area. What it means is that saturating one square meter with strong lighting can yield is much as 400-500g. Like someone else said, that could be one plant or 12 but it's all about canopy area. Your plants look great but trying to hit the breeders max...

Not sure if you used the Epsom Salts yet but the photo in Post # 7 shows Vanilla Scented Epsom Salts. You don't want that in your feed, IMO. Get the unscented if you're adding it to your plants.

"Growing in soil my ph is between 5.8 and 6.3" - you may want to bring your ph up closer to 6.5 so all your nutrients uptake properly. For soil, 6.3 to 6.7 is usually good IME. I believe Ca, Mg and P are all taken up best in soil at around 6.5+.

I use ph down if needed, but only after adding all nutrients. Some synthetic nutrient lines will drop your ph quite a bit so adjusting ph is the last step. I've never tried lemon juice but I've heard from others who have. They said it works to lower ph but it does not last very long and the root...

I agree another 3+ weeks by the looks of the photos. In coco, I feed until 1-2 weeks before chop and finish with water only (normal amount of water).

I'll check it out, thanks!

Wow, I've never bumped into others with Tinnitus before. I'm going to try those links, thanks. I tried finding strains that help but gave up. Gonna have to try the blueberry.

I'm no expert on LED but you may want to read up on the "K" rating before buying a 4000k. I have the HLG 550 V2 3000k and it works really well for seed to harvest. My understanding is that 4000k will work for flowering but 3000k is better for flowering.

A 5 ft tall 2x4 may not have enough height for a 1000w HPS. You'll have to have powerful extraction and possibly AC to keep a small tent cool with that light. I think you'll have to run compact plants and train them low, maybe a scrog. A 4x4x7 would be a better bet for the 1000w HPS.

Just throwing some ideas out...Maybe try calling the Auto pot company and ask them if they have any ideas? The other thing that came to mind is root issues. They can cause all kinds of symptoms. Is it possible you have some root rot? You could add Hydroguard to your mix without any impact and it...

My 4x4 tent was in an attic with poor insulation. I started with an LG 8,000 BTU single hose portable AC. The AC was outside of the tent trying to cool the attic plus I ducted some of the cool air into a tent port with a 4" flex hose. This worked but I upgraded to the Whynter Arc-14S dual hose...

How's your drainage? Roots OK?

Looking good, I'm sure you'll hit your goal. Just keep doing what you're doing but don't chop too early.

beercan has good advice. There are more details on corrective feeding in this thread too - https://www.rollitup.org/t/whats-this.1010528/page-2#post-15416671

Don't bother with a CO2 bag. IME, you can get by with 85f but it's borderline. MAke sure you have good airflow. My vote is too strong a nutrient mix, heavy on N.

Like Renfro says, too much Nitrogen gives you those dark green leaves. I used FF trio nutes at about 1/2 strength and worked pretty well. What's the temp?