Seedling/early veg black spotting on older leaves?

So I've been fighting this RH level between 30 and 40% and I believe these autos are stunted because of that but another thing is I noticed some black spots that are getting bigger by the day on this plants older leaves,could this just be potentially some fertilizer droplets i might have gotten on my leaves by accident? I have no clue what it is or how to fix, ps I'm a new grower and it's a dwc setup, I can give ppm readings ec and res temp if needed, using GH Trio with hydrogaurd and (calimagic-not used yet) my lights (ts1000 2x) are at like 45% intensity at 12 Inches away from canopy,here are some photos, let me know if I forgot anything else and thank you!

It certainly looks different. From a distance it almost looks like sooty mold, but up close it doesn’t. It definitely could be water droplets and a burn from the fertilizer. As long as more leaves don’t do it, I wouldn’t worry. The damaged areas will probably die/turn brown. Try not to drip water on your plants(lol).

thats moisture on the leaves, look at the shapes. i used to get that from folier feeding and not spraying them with fresh water fast enough. but looks like you may have splashed some over your leaves.
just my opinion

Yeah I believe i might have (shaking my pen testers dry), but as a update since posting they do like they have gotten bigger and turned abit brownish, I cam provide photos if need, someone said it could ne a p deficiency?

Let’s see em! It could be helpful. One thing, what’s the ph of the nute water?

Phytoplankton said:

Let’s see em! It could be helpful. One thing, what’s the ph of the nute water?

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The problematic one (brown spots) if I can remember was around 6.7 something I believe, I rebalanced it around 5.8 few hours ago as well as the rest (rest was around the same), i usually jot these down before a feeding , there seems to be another problem with the smallest one that was the first to grow the in the start but now is turning lime green with slow growth. New growth curling down? Is this possible because how high these were transplanted? I also got a humidifier and just raised the lights by a foot so 24" away from canopy, they are still at around 47% don't know if I should increase intensity? I am going to try to keep the environment at the recommended levels for the different stages because before I had nothing to control it.

P.S is there a specific reason as to the long skinny fan leaves ? Some look really distorted and I figured humidity fluctuations.

I get some wonky leaves on seedlings, usually stops around the 3rd or 4th node. Let the new ph settle in and give it a few days.

Question : What’s the deal with the cardboard ?

Cardboard ( cellulose ) and moisture would eventually cause mildew issues. Mold grows well on paper products, cardboard, ceiling tiles, and wood products.

And those pipe cleaners.

Plus “ Black Spot “ is a known plant issue. It is fungal by nature and cause dark black or brown spots to develop on the leaves, eventually leading to yellowing and premature leaf drop. Controlling humidity, proper spacing of plants, and applying fungicides can help manage and prevent black spot disease. But feel it’s mostly due to your setup.

Phytoplankton said:

I get some wonky leaves on seedlings, usually stops around the 3rd or 4th node. Let the new ph settle in and give it a few days.

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Budzbuddha said:

Plus “ Black Spot “ is a known plant issue. It is fungal by nature and cause dark black or brown spots to develop on the leaves, eventually leading to yellowing and premature leaf drop. Controlling humidity, proper spacing of plants, and applying fungicides can help manage and prevent black spot disease. But feel it’s mostly due to your setup.

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The two spots now are like.a pale brown with slight yellowing around it but the rest of the plant seems fine? As for the cardboard they are only to prevent light leak, I tried spraying painting them black (bucket lids) to no avail so i just went with tarp to wrap the buckets as is, it wasnt my initial choice but didnt want alge growth but i do have the lids taped using like a mylar tape kinda like for hvac but there's still decent light leakage without the cardboard, my best bet most likely is to just layer more tape till it's blocked, I know later down the road it'll be impossible to manage the cardboard when they are alot larger too as well as different supports to use, as far as growth I feel like 3 out of the 5 are doing great since the humidifier was added, my temps stay around 73-80F with 63-73 RH so by what I've seen for vpd that's not bad for veg state.

Budzbuddha said:

Plus “ Black Spot “ is a known plant issue. It is fungal by nature and cause dark black or brown spots to develop on the leaves, eventually leading to yellowing and premature leaf drop. Controlling humidity, proper spacing of plants, and applying fungicides can help manage and prevent black spot disease. But feel it’s mostly due to your setup.

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Any way you see how I could improve my area? I don't necessarily have proper intake/exhaust venting, let's just say a vent from the furnace and at that the room that I'm in is partitioned off from my main room which has the vent in it so the this back room has no airflow when closed off beside my ac and a fan, ive herd of closed loop grows but this is beyond diy as far as different spaces I have like a 2.5 x 2ft closet I could use depending how close they (the plants) can be in there.

yaboyG said:

Any way you see how I could improve my area? I don't necessarily have proper intake/exhaust venting, let's just say a vent from the furnace and at that the room that I'm in is partitioned off from my main room which has the vent in it so the this back room has no airflow when closed off beside my ac and a fan, ive herd of closed loop grows but this is beyond diy as far as different spaces I have like a 2.5 x 2ft closet I could use depending how close they (the plants) can be in there.

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As far as the light leak in your bucket, remove the card board and top up your hydroton pebbles to the rim.

If needing fresh air, Crack a window a few times a day if that’s all you can do!

judging by the black spot id say you dropped solution on the leaf without realizing it. let it grow a node or 2 more and strip the leaf if your still concerned about fungi, and take some hydrogen peroxide to that stripped leaf with the black spot and see if it reacts on contact.

So I wanted to get ahead of this week's feeding regiment, I hopefully put together all the important I formation right into the pictures to help tie numbers to looks, all this is before I change the res later today to a fresh set, based off the readings arethey okay? I feel like I might have burned the my thai as it's around 400 ppm and 0.8 ec but not sure, I've already lost a seedling due to human error, don't wanna do another lol

I'm not sure on exactly getting the days correct but I started counting when they was placed in their buckets (too early i feel) which would be 4 weeks ago on a Tuesday but week of feeding is on its 3rd I'm going off like two feeding charts, GH drain to waste chart as well as the grow doctor site with their GH Trio calculator to calculate strength percentages, I went from 25% to like 50% in no time(too fast?) So like 1/4 to 1/2 for all which I thought would be fine but don't look like it lol.