Yellow and pale leaves

El magnesio es el encargado de la clorofila, si no hay clorofila no hay verde

Yellowing kinda looks like magnesium to me. I don't know the Canna nutrient line to much or its tera subcategory. I do know there coir products and I like them a lot. I would recommend trying to compare your feeding it their suggested schedule for feeding and checking if anything is a miss. https://www.cannagardening.com/growguide - just input your pot size and water. As for EC being to high. It could be that it is locking out other nutrients in the medium? From what I can find online the Canna tera floras is 2-2-4 npk. Seems a bit low on p and the ratio is weird for p and k compared to N. Maybe this is made up in the other products I did not do a full deep dive into the nutrient line. that's something you will want to look into. I think adding in some calmg would be helpful and the PK boost could be a good thing once you confirm the above susgetions, as long as its all within your EC allowance and wont throw it out of wack. it should be good to go. Good Luck!

Hey buddy. Looking through your grow and nutes strength you are using, I might have solution? Are u mixing all nutes together or giving them sep. As u are using a high dose of all key canna products which have enough of everything you'd ever need. You have nute lock or poor roots. That and you are using 5ml/l of 1 nute compared to half strength of all other nutes. When mixing nutes together you need to give exact mixes if you want to add extra of another certain nute just mix it up Sep in a 2ml/l solo mix. Also bring down the N, I can't tell what's in your nutes. But you are focusing too much and if you are giving them same nutes from beginning to start it'd be best to give them sep and mess around with doses as plants in flower love boosts in something as opposed to giving throughout the whole grow. Here's some info on the importance of PK and how they move water around your plant and the importance of flushing and mixing nutes evenly. If you need more info on m8ximg nutes I successfully mix 14 nutes together without constant nute lock, yes, I've had nute lock around 3 dif times on the same plant but if you watch your girls closely and slight change you catch and fix your plant will hardly have any notice. My lockout got so bad my ppm got to 8500 in 200ml of run-off so she was drinking the water taking some nutes but leaving most behind. https://www.360yieldcenter.com/2015/05/soil-nutrient-series-part-1-nutrient-movement-and-root-uptake/ Good luck pal

Since you use Canna products, try Canna PK. It seems you are potassium deficient. Your plants need it at this stage of flowering. and reduce the others a little

Haven't used calmag, but my water is very soft so I guess that is one thing to do - but is this the cause?