Can’t figure this out. Any help is greatly appreciated

Hey guys. Im new to the site and this is my first post. Hoping some of u guys can help me out. I guess ill start by giving some environmental details. I recently had to move into tents due to space issues and im currently growing in a 4x8 tent. Space juice from solfire 20 clones about 2.5 weeks from transplant in half gal pots coco/perlite 70/30. Fed once per day 1.7 ec 5.9-6.1 ph to a little runoff using jacks part a and part b with some epsom. I have 2 3x3 tents that i plan on moving some of these plants into. Right now they are growing under 2 hlg 600r’s 36 inches away from the canopy and i have the dimmer set to the 3rd setting, which reads about 21,000 lux on average throughout the tent according to my cheap uni-t lux meter. Temps and humidity are steady between 78-82 deg and 58-65 rh. Fans for airflow. I have been getting orange or brown leaf edges that seem to continue to get worse while all of my new growth seems to be nice and healthy. I have been going back and fourth between deficiencies and possible light burn? I am just not really sure and wondering if any of u guys have dealt with this before. I have a few grows with these lights in an open room setting and never had these type of issues so im just not sure whats up. Ill throw some pics up. Thanks in advance for any help.

It looks like the pics I've seen of potassium deficiency. Never experienced it with my plants. You're using Jack's 5-12-26? I don't see anything wrong with your specs, and that formula should be sufficient K. I'm not familiar with their line up, others here are, or used to be. You may find something useful via search. If you can obtain some potassium nitrate, you could add a little of that to boost the K. It also adds some N, though, so ...

Once a day with a little runoff?
Ph is measured where?
I just don’t see coco holding enough moisture at those temps on a single light watering but it sounds like you’ve done it before maybe with different lights ?
My final inquiry is that weather is warming are you cooling your rooms?
Temps vary a lot seasonally for me especially with LED’s
oh and welcome to RIU

Herb & Suds said:

Once a day with a little runoff?
Ph is measured where?
I just don’t see coco holding enough moisture at those temps on a single light watering but it sounds like you’ve done it before maybe with different lights ?
My final inquiry is that weather is warming are you cooling your rooms?
Temps vary a lot seasonally for me especially with LED’s
oh and welcome to RIU

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Thaks for taking the time to reply. I really appreciate it. When i say little runoff i mean sufficient, but not a flush? I would say between 10-20% runoff. I dnt go to multi feed until i up pot to their flower pots usually. My ph going in is fairly consistent at 5.9-6.1. I have a bluelab soil ph meter and it is 6.1-6.4 medium ph throughout the tent. I know that some are on the “high” side but still in range and i wouldn't expect this. They have been in half gal pots for 2.5 weeks since they came out of the cloner, and feeding once a day has kept them moist with a little dry back up to this point. I am probably about a week behind up potting as i have been trying to sort this out. This is my first time in tents, but i have inkbirds and regular probes to monitor temp/rh. Ambient temps in the lung room are 70f and 50rh. Im growing in my basement so the central ac keeps ambient trmps pretty steady. Thanks for the welcome brother.

simpleleaf said:

It looks like the pics I've seen of potassium deficiency. Never experienced it with my plants. You're using Jack's 5-12-26? I don't see anything wrong with your specs, and that formula should be sufficient K. I'm not familiar with their line up, others here are, or used to be. You may find something useful via search. If you can obtain some potassium nitrate, you could add a little of that to boost the K. It also adds some N, though, so ...

Click to expand...

Thanks for the reply dude i really appreciate it. I thought the same about potassium, but i know i am supplying enough. So i guess figuring out whats locking it or whats going on if it is in fact potassium is the key. I have never experienced this either so its a real head scratcher to say the least.

I haven’t ran into any of these type of issues in any of my past grows so i really am just trying to figure things out.

Ok so its been a few days since i posted. These ladies are back on track and looking much better. Here’s some pics

Little update. Things are going pretty good since the rough start. I will flip to flower tomorrow. Im gonna drop a net down on them and let them roll. 12 space juice from solfire and 4 phone home from bodhi.

What did u determine the problem to be?

SBNDB said:

What did u determine the problem to be?

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I think it was a combination of things. I was letting my pots dry back too much plus giving them too much light. Since i went back to multiple feeds a day and raised the lights up things have been running smooth.