Nutrient burn or defiency

I flushed first the soil. I'm gonna give bio-grow in next watering. I realized that the super skunk looking best and i haven't give ger any nutes.

Looks like a lockout situation to me. As plants transition into flower, they slow down on water consumption for a minute, then when they start drinking again, it increases. This can cause the soil to change ph. They also increase their need for P and K along with calcium and magnesium. Start with the basics, check environment, watering practices and ph. After those are stabilized, check your nutrient ratio, too much of one thing can lockout another. Autos can be very sensitive, less is definitely better. Good luck!

calmag ,also you need first of all know youres runoff ph,to seee whgere you at

To little nitrogen is my guess as well, its when the old fan leafes start getting yellow

nitrogen deficiency.. can see it start at bottom and move up plant in your last 2 weeks of diary. Some other symptoms ahve shown up, but not at the saem time. your fertilizer mix is out of balance.. more N seems certain. K/Ca/Mg should all be evaluated. you'll have to do some work on your end to eliminate possiblities as there is not enough information given, here. grab a leaf chart off google image search, and consider recent fertilzier dosing - overall concentration as well as each relevant molecule that the plant needs. - the plant is made of teh same stuff over and over again... you need the right ratio as well as concentration to meet those needs - if soilless/hyddro you proved 100% of that, in soil you ahve to consider what the soil has and supplement that... a few more unknowns with soil but can learn to ride that bike with a little balance too.

Its all ph lock out. Your showing multiple deficiency signs.