Looks more ;like burning from feeding too much or too often......or both.
Easy to do when you are giving 8 or more types of fertilizers/supplements.
Nothing at this late stage will fix these issues before harvest is due, but had you asked this question 3-4 weeks ago when the symptoms first started appearing.........
Also, if you are doing a diary, give as much info as possible, not just a few random details.......soil/coco/hydro are all vital pieces of information that will guide peoples' answers to any questions you may post in the future.
And always link a diary, people want to help but don't want to have to hunt everywhere for the basics.
pH is probably a bit low for hydro too.