Wind burn? Light burn? Nutrient burn? Everything everywhere all at once?

@Ctrellis yeah, I'm feeding it but not a lot. I posted a breakdown in grams here. https://ibb.co/nDN35Sw I'm using a blue lab PH pen. It shouldn't be the nutrients.. Because the other plants that are using Advanced Nutrients have the same problems! It's driving me mad.

Are you feeding them anything...

Are you absolutely sure your pH is right? Thats the only thing I can think of at this point besides bad growing medium. Hope this helps

@gottagrowsometime, if you read this, I have done foliar spray of epsom salts a few times on this plant as I thought it was mag def at first, but it seemed to make it worse and caused a mag toxicity.. or was that dark shade of leaf its normal color? it seemed sick to me. it was around week end of week 11 to 12 to to beginning of 13.

The easiest way to fix major deficiencies like this ons it by flushing the soil once with 2 times the pot volume in water with the right pH and a small amount of nutrients. After you have done this let the soil dry out for 2-3 days and than you can continue watering like you did before but with less nutrients, the right NPK ratio for every phase of the grow and the right pH. And occasionally water till runoff to get rid of the build up salts inside the soil to prevent issues like nutrient lockout.

All your plants could do with an injection of mag pal. It's clear to see that. I can't see any bend, coning, edges crippled. This is all related signs to what you asked would it be these. I don't see any of that. Just fade in-between the vains. Good luck

None of the above. Epsom salt feed will curve your Mag issue. Also very light coloured. But mag/sulphur will help 150ppm added to your ambient tap. Good luck.

Here's a rough breakdown of the nutrient solution https://ibb.co/nDN35Sw

In my closet grow this isn't happening. It's another grow that I started to troubleshoot this issue. The only difference being is I don't have that much airflow in there, and humidity is lower. My PAR meter is a cheap one and it reads 600 at the center. This plant is at least 4 inches lower and off center (and I raised it today. it was even lower before). Never had fans blowing directly at them. I have one fan blowing from the top of the tent as an air intake and the little sleeve is roughly pointed at one of the walls, the other one was on another corner blowing at the humidifier corner. Today I have moved it to the floor, right in the middle of the tent, still pointed at the humidifier corner at an upwards angle so I don't have too much leaf movement. You can check this problem throughout all my diaries. I am using cheap nutrients for this plant, but I bought Advanced Nutrients just to be sure it wasn't a nutrient issue. I'm using that on the other 2 plants but the problems are still the same. So what do you think?

looks like an Fe or Zn deficiency, but that'd be kinda rare. any reputable soilless nute line up will have the micros included. Consider levels of Ca and P, which cna lock out Fe and Zn. The burnt tips also brings sulfur deficiency into realm of possibilities based on symptoms. 500 ppm is quite low. unless something is out of balance you should be able to kick that up to 600 - 700 even with a nute-sensitive plant given ambient co2 and basic control over temps and RH. can go higher with more optimized environmental variables, with co2 being the limiting factor. without a breakdown of ppm per nute, or other similar info, hard to give a specific answer.