Spots/Dots and unhealthy

thanks to all who answered, you were all kind of right about the issue so it's very hard for me to pick a "winner" please dont take it personal :) ! The day before I posted the pictures I flushed the medium as I suspected overfeeding which generated some nutrients deficiency as some of you suggested. Growth seems to have resume and the issues stop spreading and I'll switch to flower now :) ! Thanks again to all for your precious helps !

Hey! By what you described and looking at the third to last photo it looks like boron deficiency. But the other pictures look like calcium and magnesium deficiency, whatever it is it usually happens when there’s a lockout of nutrients or the PH isn’t correct. Remember when mixing your nutrients there’s a certain order to mix them or else they’ll lock out. CalMag-micro-grow-bloom-ph last... This problem can be fixed by back checking your feed, checking ph in put and runoff. After checking out what your pH I would flush the roots and reorganize your feed. Remember that when it’s roots or nutrient problem it takes the plant 3-4 days to show signs of change. So be patience and don’t try to do it all at once. Any questions let me know. Good luck and happy Growing!

To my untrained eye it looks like Calcium and Sulfur deficiency and probably could fix by changing how you mix your nutes and/or the alkalinty and ph of water you use .