Hi all, First time grower here. Been trying to figure this one out with search and google but I'm out of ideas. This girls is on her 28th day - 250w HPS in a small 60x60cm (4inch RAM exhaust). PH level read 7 - 7.5 Pic1 As you can see she has white marks on her upper leaves, and some 'burn' spots on others. She also had yellowing of the lower leaves (trimmed all the worst affected). Earlier this week she was looking worse, with all new growth with white marks and suddenly quite slow growth (before that she had been great). So she had the first round of nutes (Tomorite), and raised the lights up which helped a lot overnight. also bought some Cal Mag in case it was an iron, or magnese deficiency, which was given to her 48 hours ago which helped-ish (less than than the raising of the light and Tomorite). Pic2 Is from before all this happened about 7 - 9 days ago As the title, do you think this is a deficiency or just light/heat stress? Very wary not to over-counter it and make problems worse. The new growth at the top doesn't seem to be affected. There has been with low humidity levels (around 30 - 40) which I corrected with humidfyer when really low and spaying walls of tent in case that's relevant. I am aware that a 250w is fairly big (?) in such a small tent so maybe it was too close (followed guidelines on here). Thanks lads Seed is O.G Kush RQS