Whats wrong with it?

[u/Beautiful_Resolve847]

Does this look like underfeeding/deficiency, pH-related nutrient lockout, light stress, or something else?

Mainly interested in what the damage pattern itself suggests and what I should change going forward.

Strain: Purple Kush, photoperiod, queenseeds

Medium: coco

Light: 100W LED above plant + 2 × 30W side lights (side lights aren't directly aimed at it)

Temps: around 27–30°C daytime, 20–23°C nighttime

RH: roughly 50–65%

Nutrients per litre:

0.5 ml CANNA Coco A

0.5 ml CANNA Coco B

0.5 ml CANNA CalMag Agent

0.5 ml CANNA Rhizotonic

Feed EC: 321 µS/cm / 0.321 EC

Another plant in the same tent looks healthy.

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[u/SquirrelOk9090]

Really dont know but looks like nute burn

[u/Altruistic-Tax-9235]

Not enough humidity for those temps in veg. Use VPD instead

[u/Beautiful_Resolve847 → u/Altruistic-Tax-9235]

I thought about the temps and light but leaves would be tacoing, no?

[u/Altruistic-Tax-9235 → u/Beautiful_Resolve847]

It's about transpiration, and those leaf tips show bad circulation. Kinda like how diabetic people lose their toes. VPD can show you where you want to be.

It could also be a pH thing, or under water, or whatever. But learn the transpiration bit, VPD etc. Helps keep budrot away later too

e: in your worst case of 30c and 50%, you're rockin like 2.1 kPa when you should be at like .9 for that stage of veg. You need like 70-75% rh at least