Should I flush with 3-4 weeks of flower left?

I grow regular period but I flush every 2 weeks as Fox Farm Suggests if use if high Coco it also gives me better controll of the nutrients avalible and eliminates nutrient lockout and PH problems. Also jut good maintenance for root health

What happens if I flush and it’s not nutrient lockout? My leaves are getting more yellow by the day and they have small brown spots on them. I throughly magnesium deficiency, but doesn’t look like it to me. I also thought nitrogen deficiency but added some Fox farm and no change. Does she look healthy and like she’ll be good for the next 3–4 weeks until harvest or should I correct with a flush or any other ideas?

Hey Growmie, if you are positive that it's nutrient lockout then yes go ahead flush the plant so she can get back on track and finish up.