I may get lol'ed for not being able to diagnoise these

ok so i am trying to grow 3 different strains at once,

1. Super Skunk,
2. Blueberry,
3. 8 Ball Kush


I believe the blueberry to be suffering from nut burn a little


as for the other 2 possible heat stress?? also the leaves do look a little pale and the bottom leaves look a little worse for wear, using canna coco nutrients at roughly only 400 ppm which i thought was weak but i really just want somebodys experenced eyes to have a quick look.

3. 2. 1.

Maybe add a little cal/mag?

well, it looks like you've found out just how much of a pain in the ass that blueberry can be to grow, it's a notoriously hard and finicky plant to grow all around, no matter whom the breeder..

they look like they could use a lil nitrogen with that yellowing going on imo...

hope this helps
View attachment 2087918