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Just keep going, you're fine.

Plant abuse. Honestly I can't say what exactly you have going on but I'd guess something is up with pH or feeding. You've got severe damage on a few leaves, but most of your leaves also have interveinal chlorosis. I also see tip burn. What fertilizers and supplements are you using, how much...

I doubt you'll get nutrient burn of any kind, but it would be good to know whether and how much cal/mag you might need to supplement with. Now heavy metals are another issue. Cannabis is verified as a heavy metal accumulator, and many wells have heavy metal issues, not to mention other...

Either way, you SHOULD have negative pressure within your space, so leaks shouldn't be an issue anyway. Pushing through it will work just as well for filtering odor, but not as efficiently, usually meaning more energy draw and an overworked fan. That's for certifugal exhaust fans. I don't...

Loose lips, and smell, are the biggest concerns. If your neighbors smell it and report it, and the cops come, you're toast. That said, the carbon filter will work perfectly so long as its used correctly and the grow room stays closed as much as possible. That means on harvest day, you're...

I'd follow the recommendations, if anything at all. Since you're fertigating you're probably running something with a high concentration of N and P, which makes mycos dormant, and doing so so regularly that colonization probably isn't too likely. Others may disagree but I'm honestly not...

If you can duct through another duct like for a dryer, that's best. Otherwise out a window I guess. Man, just saying, I'd NEVER have the balls to grow in an apartment.

I used to stink up the entire house with two plants. That was about 2400 sq ft including all rooms and the basement. You could smell it when you opened the front storm door. Carbon filter INSIDE the tent, sucking air through it, not pushing air through it. I'd get an Ona or two for outside...

The hairs are stigmas. A lot of people call them pistils because they're part of pistils. Some call them pistols because they can't spell. Regardless, the plant looks good, and not at all weird.

What's your medium, and what stage of growth?

Looks like transplant stress to me, and maybe a lack of nutrient depending on what soil you transplanted into. But primarily transplant stress honestly. But, this fungus on the pots...and nitrogen toxicity...could the fungus have just been salt deposits? I know my grow bags always ended up...

You need to start feeding, yes. I don't know Pure Bloom Pro, but you do need to start feeding. And a pH of 5.0 is insanely low, especially in soil. 5.8- 6.2 in Hydro, 6-7 in soil.

Also, assuming you get this handled, what's your next step? That looks like a very small, and fairly permanent container, and you're definitely going to want to pot up.

Me closing my eyes in the only photo I got with Dan Aykroyd.

Seconded, especially on the watering. And don't cut back on the AMOUNT of water, cut back on the FREQUENCY of watering. I'd personally give it a week until next watering. Water to runoff and leave it for another week.

I can't say for sure what your issue is...I'd check your nutrient solution is where you want it, make sure pH is where it needs to be, and keep on keeping on. Get everything in check and finish out your grow. You're not far off from harvest, and there's probably not much to do about bugs but...

5 days old? Top two leaves? Like, the first set of true leaves fell off?

Like you said, you're treating them all the same, but one is getting more light than the others, so it will have different needs. Oh, and PPM is just what TDS is measure in. Total Disolved Solids are measured in Parts Per Million. Be aware, different companies and countries calculate this...

18 inches seems fine to me. Any idea what your EC or TDS is? You could carefully do a foliar feed on the fan leaves and see if it greens up. If so, maybe get more aggressive on the nutrient for that particular plant.

What kind of light, how intense, and how far from the canopy? I agree with Bob on the light, though it's possible additional feeding could help the plant keep up with the additional light. Just a thought.