First grow improvisation RS11

I find this happens when over watering has been a thing and some root rot or some weird growth in the root zones is happening. Might need to amend with more perlite next time or dial in your watering habits. The yellowing of the lower older growth also does seem like it is not getting enough N. But the leaves should not be burning, twisting and collapsing into a thin folded blade. if all it was is N they just yellow nothing else. that is a key indicator to me its root issues maybe rot. Some of the spotting does look like PH but I would expect to see that on the whole plant not just some of the lower leaves.

looks like normal, because the are not getting direct light (: would not worry! adjust ph to 6.4 and feed some N 🌱💚

Hello mate, you have an issue with Ca/Mg caused by a pH fluctuation or a misfeeding of Calmag product. The first cause is often link to the rate of Ca/Mg in the water used to watering the plant, if you use organic feeding you must have the rigth rate of these nutrient that is 3/1 or 4/1. Good luck and happy journey!

Hello There- I would adjust your watering schedule. Frequent, small waterings cause root issues and lots of nute buildup in the soil. I think most of the problems you've seen on your plant in your diary are related to watering. For a 5 gallon pot, you should be watering (IMO) 1+gallon (or 4liters) at a time and then at least 3-4 days before the next watering. Of course...have to pay attention to the plant. Some get very thirsty.

More than one thing can cause that, so you're best seeing how it progresses. If mindflowers is right, that's either genetics cooler temperatures (68F or below) occurring at some point in daily cycle. If it's definitely red/purple coloring, then it's just genetics / cool temps. They look black to me, but photos are deceiving.

Looks like anthocyanins starting to color the leaf to me. Watching those plants like a hawk. as you should. looking good

no light = dead leaf solution = lollipopping 💚

The plant puts in the lower leaves that it is ready to sacrifice toxic elements or overdosed elements. Mineral fertilizers can cause this effect by forcing the plant to assimilate them even if it does not need them. It's normal so, there's no need to panic, the plant protects itself and manages the elements it accepts and those it rejects. 😉✌️

The 'red' i see may also be a camera illusion.. if you don't see reds or purples with your eye, nevermind.

https://420life.com/wp-content/uploads/2021/10/Marijuana-Leaf-Deficiency-Chart-scaled.jpg Kinda looks like a P issue. But your also almost done so could be a bit of fade? Also the feed has lots of P in it so it should not be deficient at all. Bloom 4ml 12-36-12 / Boost 3ml 9-10-38 = 10.7-24.8-23.0 NPK ratio. Ton of P. almost to much. Your suggested feeding for the nutrients used is here : https://420flow.de/cdn/shop/files/FINAL_V2.png?v=1713467798&width=1000 This is also a good tool. https://www.nutriag.com/wp-content/uploads/mulders-chart.jpg Its shows high P requires High Mg as well and can make issues with Ca. I would monitor the EC of the solution and back off some of the feeds as it nearing end of life. Also do any of them feeds say their micro content? Eg. Fe, Cu, Zn, Mo, Mb,?? Also you are getting a good amount of runoff when feeding them yes? if not it could be a build up casing issues.

It is absolutely normal for late stage flower to develop dark colors in the leaf. A lot of places are actually breeding that into the plant because it’s turned into a desirable look. I did a quick search for the RS11 plant and it looks like the majority of all the end of flower plants have a very dark purple leaf. I would say you are right on track and keep doing what you are doing. It should turn some lovely color by the time you are ready to harvest. Hope this helps.

Purple genes in first two and last. Fade and lack of phosphorus in third photo ... but its all in natural phaze of canna plant. Would not worry about anything !