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It's certainly not heat stress. Nute burn, well the symptoms look similar. I only use organics (BioBizz) and have given so far about 2-3ml/1.5l of Grow and Bloom every watering. That doesn't seem excessive to me? No one has yet suggested phosphorus deficiency? The edges all around the leaves...

The leaves are green, it's not mag deficiency. The rolling happens more towards the top, the margins in the bottom.

Alright the pictures are not actually taken at the same time and the problems might or might not be related. In the upper picture you can see the dead margins and in the lower the rolled tips. Also the tips of the rolled leaves appear to be kind of darker green and dry. I have some ideas what...

The plants are yellowing from bottom and going up. Seems like the veins are kept green. Looks like a classical mag def right? Could this also be caused by pH being way off?

Ah i think I submitted to wrong subforum, sorry guys. :P

This plant has started severely yellowing. It doesn't look like simple (at least not solely) Nitrogen deficiency tho since some of the veins look green. The yellowing affects the bottom of the plant. I have gave the plant 2 times about 2ml of BioGrow before but doesn't seem to be fix it...