More pics, hopefully a bit easier to see.

What causes the leaves to curl up like this? I've done a bit of searching but there are a multitude of different answers coming back from (K) deficiency, (Mg) or (Zn) deficiencies, bit of a mine field.

Thanks for the input.

Cheers.
MistaJ Reviewed by MistaJ on . First Time Caller... Hi, Been looking through the curtains at the site for a while, great place, lots of info and finally decided to give it a go. Have a small problem with a couple of our plants, think it could heat stress, maybe a nute deficiency as well and was hoping that someone could help. E-indoor or outdoor Indoor E-soil, soilless, coco, aero, or hydroponic Soil E-specific medium 10L Pots CSL-Soil type/brand Bio Bizz All Mix Rating: 5