Is this cal-mag or potassium deficiency

Please help week 6 of flower I don’t know what is going on

Can you tell us more about your setup? And start with light and medium please

Bukvičák said:

Can you tell us more about your setup? And start with light and medium please

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4x 1000 watt hps turned to 750 I use bush doctor coco loco and mills nutrients plus cal-mag

Temps stay between 73 night 79 day all lights are cooled and have a mini split humidity it stays around 50

youngwun11 said:

4x 1000 watt hps turned to 750 I use bush doctor coco loco and mills nutrients plus cal-mag

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Hmmm, I dunno about that nutes and medium, but based on the pics I would say it has close connection to the light as I see marks of light burn on affected leaves.

sure looks like heat stress, but its affecting lower leaves as well as ones closer to the light. its uneven so it could be something else. sorry cant hrelp more

Looks a lot more like its a potassium deficiency to me.