Lower Yellowing/ late flower low canopy

I'd be weary of the advice given by @Nugsery, their first answer was 100% fact - magnesium deficiency, and now they have deleted their original answer and posted something completely different to match the other growers. Its a bit sus and I don't trust them, to much sketchy stuff happening aorund them recently from a new grower with no grows under their belt. Cheers,

Water at least once between feedings I flush every 2 weeks for maintenance I use Sledgehammer to start and finish with Sensizyme to do clean up

High bro, this is 100% natural for this phase of the grow. Those are just the (for the plant useless) bottom leaves and she is putting all her energy in making those buds fat and juicy! The rest of the plant is looking great and you will have a big yield when harvesting this plant! Enjoy your harvest!

I'm agreement that it's not a magnesium problem. Your getting close to harvest, them lower leaves don't receive much light and its nothing to worry about, feed water feed water will be fine as grannie said.

No. It's not a magnesium deficiency... and I don't think you have anything to worry about. Glad you switched to water/feed/water/feed from the constant feed - there's probably a lot of stuff in that soil that needs to be gotten rid of... If you have an EC pen, like m0use suggested, it would be good to use. They're fairly inexpensive. Good luck!

Looking at previous week - N looks like it’s basically at 0 - you still need nitrogen in flower. To me it just looks like you ran that clearex too long. Get back to a good feeding regimen.. make sure ya got some N in there too.

It is hard to tell when your feeding with liquid nutrients and there are no EC readings on the diary. The EC of the feeding solution is a very important part of things and the EC pen is a great diagnostic tool to help problem solve. I can say for certain what this is, or why its happening, But I would guess the medium has to much of something and its causing this to happen. I would also not be surprised if the runoff is measure the EC would be out of range, there is also the option of monitoring the runoff PH and that can sometimes give an indicator of whats happening in there as well. Some people can grow with out a EC pen and use liquid nutrients, I am no way one of them people. But if one of them chimes in and says its ok then maybe it could be a deficiency but right now I'm leaning the other way. One other note, my plants sometimes do this and it never gets to bad so I don't worry about it "not the best idea but it works for me". If it is progressing you need to find the source. given that its happening from the bottom up its better then the top down. Magnesium is a somewhat mobile nutrient in plants so it could be that. its is not likely a immobile nutrient so that's a good clue as to whats happening. FYI: We will not be notified of any reply or tag [@] in the questions part of the website, if you need to reach out with other information use your DM "direct mailbox" in the bottom right hand corner of the page. it looks like a little paper airplane icon. Best Of Luck!