cal mag?

You are in a plastic pot. Pull the plant out and look at the roots.

@amar2393 - what nutes are you using? what are your ppms at when you feed? how many times a week do you feed? whats your ph when giving h20 and nutrient solution? If your using a feed chart as a guideline, what chart are you using?

Capulator said:

You are in a plastic pot. Pull the plant out and look at the roots.

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i was about to say the same...i see the pots look to be over watered and on a cold cement floor...

but to me it looks like combination of overwatering displacing oxygen in the root system...roots without adequate oxygen will not thrive and will die back and rott...also looks like you over fed, then flushed too much, and then did not feed, causing a ph imbalance or root issues...

whats your runoff? ime in promix anything over 4EC is toxic, and anything under 2EC leads to deficiency(talking about runoff)....as fo ph runoff...if you checking runoff, you have to do it properly, most dont, most will just pour a shit ton of water through and measure run off...the proper way to do it is to water your plant properly with plain water, let just a few drops come out...wait about an hour, now you know the media is fully saturated, then pour a few cups(depending pot size) throught he container and collect the runoff and test it.

First I'd put the plants in a large saucer. Water on the floor. Is never good unless your enviro controls are up to par.
Like Cap and Joe said check the roots see if they are mush.
I use Airpots with promix (dry out faster) so I'm curious when u try to lift them are they dead weight?
Next run either way I'd amend with some perlite in that closed pot style regardless.

Now your enviro.
Your plants are for sure not feeding as they should, they are transpiring to live.
Too dry at your temp and rh %.
Stomata isn't effectivley opening at that VPD.
I'd lower your temps or raise the humidity.
Why HPS in veg and not MH or T-5?
Personally I never ran an HPS in veg. SO tough for me to talk about results when I have no idea. Saving that for flower, more red spectrum is more customary. More white blue in MH/T-5.
Kelvin of your lamps I don't know your brand.
I don't ever turn lights off in Veg. Minimum 21/3. I did 18/6 for a minute when I just started and then 21/3 up until the new grow space. Circadian Rythym, Personal pref though.
When you turn your lights off your plants will stretch regardless of photoperiod, you want them as short as you can with the nodes as close as possible to make the most of your ceiling height and light penetration. To me that is logical and not a personal preference. In other words leave your veg lights on all the time.
Bump up on PPM after this is sorted. Week 5 in veg for plants of that size for me always been able to increase the ppm to 900-1100 easy if not a bit more. Brand specific learning your nutrient brand is insanely important, without any sort of history to refer back on.
I just switched up my brand and growing method, so it has been a little bumpy the past few weeks also.
Your running HID. They should be drinking a lot more right now.
Feeding 2x a week IMO.
I suck so bad at reading that deficiency chart but I was running the same brand for so long all I ever needed was cal-mag and rainbow mix. So right at any potting stage I'd add the mix.
Cap has a benie line people are running.
DNF makes the veg fortifier, it is part of your base line. I'd use it.
Personally I feel when ur going to run any brand you need to stick with the supplements that they offer because no one knows what is in it but for them.
Like when people use AN and never use the whole line, then your going to be chasing deficiencies. Think that is good business practice. Corner your users why let them purchase other peoples stuff. May not be moral but that is what they do.

salmonslammer said:

fungus gnats rarely cause that type of problem unless you have thousands of them i cant really tell from pics whats going on.The one thing that i have noticed is that ra usually appear around week 4 of flower they are very strange that way also fungus gnats flutter when they fly ra are more deliberate in there flight and are attracted into your lights! if you can catch 1 a sure way to tell is ra have 2 exhaust pipe looking things coming out of the top of there rear portion View attachment 372380

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Sent a pic to local store owner I go to. He was thinking white fly larvae. I'll pull up some pics tonight. So far we eliminated RA, leaning towards FG, and someone chimed in with White Fly.

Delerium said:

i squished the little buggers head a bit trying to get it off the root.s
View attachment 372288 View attachment 372289

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From the attached pictures, I would really lean towards FG. Cut up a potato in slices and place on top of your pots. The adults will gravitate towards laying eggs in there instead of the hydroton. About every 3-5 days switch your potatoes slices out.

When I tend to get FG, I will do this and a combination of sticky traps. Once they were so bad, I lined my rockwool cubes in duct-tape to catch them. It oddly worked great. :joyful:

Greenjean said:

From the attached pictures, I would really lean towards FG. Cut up a potato in slices and place on top of your pots. The adults will gravitate towards laying eggs in there instead of the hydroton. About every 3-5 days switch your potatoes slices out.

When I tend to get FG, I will do this and a combination of sticky traps. Once they were so bad, I lined my rockwool cubes in duct-tape to catch them. It oddly worked great. :joyful:

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That is great, another use found for duct tape.
Potatos, that is interesting home remedy.

Can't see anything with the lights on, the yellow HPS is washing the leaves color out.

Canalchemist said:

Can't see anything with the lights on, the yellow HPS is washing the leaves color out.

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Amar has the lights off

It all looks yellow, which in my experience means cut your loss.

Peace