Posible quemadura?

Without looking at any of your other nutes, I zeroed in on Fish Force and good golly miss molly... Here's the thing, plants need a good amount of nitrogen during their veg state but not so much during their flowering state... yes, they do need SOME but too much will lock out other vital nutrients and that's what's going on here. As they go into pre-flower, you want to be knocking back on the nitrogen-rich nutrients and increasing the nutes that are heavy on the potassium and phosphorus (the P and K). You should also be adding in some calmag once a week at that point as well. Examine all your nutes.... I personally would completely stop using the Fish Force... and I would be cutting back (by half) the other nitrogen-rich nutrients. Since you're probably in a lock-out situation here, I would flush your plants... take 3x the pot volume of pH'd water and run that through each pot ... then let them dry out. Once they're dry and needing something more, you can give them a feed but cut the nitrogen-rich nutes by 3/4 (getting rid of the Fish Force) and the others by 1/2... when that dries out, you can water again and the second feed you can bring your nutes up to where they were but keep the nitrogen-rich stuff at 1/2 strength... Good luck.... and oh btw, this has absolutely positively NOTHING to do with heat or lights...