What did I do now?

I see It needs NPK especially N They all have WPM

It's at about this time in a grow when all plants start needing a whole lot more P and K and less N than you've been giving during veg.... What this is showing is a pretty good P&K deficiency (mostly a phosphorus deficiency) perhaps brought about by a nitrogen toxicity which has locked out those other terribly important nutes. I have no idea what it is exactly that you're feeding but the NPK ratios ought to be about 1-5-4 ... your EC is good, could/maybe SHOULD be higher ... and your pH is also good - just juggle around with the ratios. Good luck.

100% nutrient deficiency. The leaves are showing mostly Nitrogen deficiency. Either 1. Make sure you are mixing the right amounts as instructed by the bottle of nutrients you are using. OR if you're doing some self experimentation 2. At this stage your plants are extremely hungry so increase the amounts of NPK given

Yeah they are definitely under fed. Your ppm is low for the stage in bloom. You wanna ramp that up to around 800-850. Hope this helps

Add more potassium to your diet. Good luck.

Unfortunately, I don't know the fertilizer you use, so I can't be precise.. It seems to me like a nitrogen deficiency, but we would need to know the NPK of the fertilizer you use.