Nute burn or light stress?

I'm week 6 into flower and I noticed some tips getting burned and leaves curling a bit. No idea if it's because of light or nutes, but here's what I have:

Nutes: Growing in coco, watering with EC 1700 solution last week, runoff EC has climbed to ~2100 during the last few days.
Light: Mars Hydro TS1000 LED 30cm/12" from highest colas, 40cm/16" from most of the canopy. Luxmeter gives me 50k at the brightest spot.

yes

Heat stress

Trickyticky said:

Heat stress

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Temp at canopy level is ~24C

Look happy to me.

They look healthy, looks like a slight case of Light Stress. Tips burnt and some curling are typical signs for that.

Dosnt look as though they have to long to go now . A mean ya can just ride it out but ya might end up with ya top buds bit bleachy White .
Yes ya temps are ok but if ya have ya light too close t get them temps then ya gonna suffer . Raise ya light couple inches and eighther slow ya intake down or increase ya exhaust.
You have total control of ya garden .

yes to both. A little light stress and a little note burn

Thanks, everyone! I've raised the light and did a thorough flush + lowered feed EC.

Will the curled leaves go back to normal or should I just watch out for them going worse to make sure that the light is at the right distance?