Here's my sad 24k clone. I'm sure it will make it, hopefully. Lol
Trim the leaves in half on your clones. It promotes root and new shoot growth.
For QB boards I run 1 in VEG 4K 260v2 and 1 in flower turned WAY down its 3k 260v2.
I have other lighting in addition to the QBs.
That plant with the yellow margins just needs a bigger pot she will be fine.
Looks like you already up-potted her. She's looking a little happier.
No amount of cal/mag will help root bound plants. I get this regularly with plants I let go too long in VEG. They out grow the smaller containers. You can help a little bit by adding in some EWC mixed with Kelp meal say 1/2 cup each top dress and water.
Your flower room looks good.
That 1 plant you gotta nurse maid her. Kelp meal and EWC FTW - can make a slurry - just add a cup of each to a gallon of RO water and let sit an hour stir and water in. Spoon some of the muck into the pot. Can do that to all of em.
Wont hurt even if you're doing bottled nutrients.
She's likely missing a micro nutrient of some sort. Picky plant. Kelp Meal has EVERY micro nutrient a plant needs to thrive. It will fix this.
More soil usually works. Do you compost at all?? Have a vermi-compost bin?
BTW - I'm here for the Canadians! lol