Rust spots

re-assess watering habits.. if giving some top-down ordained volume as opposed to what is needed to fully saturate each time, i'd point my finger in that direction. Exact details slightly differe from soil to soilless, but mostly similar concepts outside of how much runoff you should shoot for. otherwise ca-deficiency by looks of it. Ca is one of the first things that will have issues when pH swings around too... eliminate that as a possibility before changing nutrient formula.

Flush to push excess... say whaaaat? Tips burn... where? Ffs man why are u doing this ? U clearly don,t understand what you see and tell...

Does not scream fungus to me. Looks more nutrient and medium related. I would guess its PH and to much feed. Previous weeks looked to have a PH issue with some of the leave sysptoms. I've used Gaia Green b4, its nice but I run into issues in flower a lot cuz not all the nutrients in it break down at the same rate. It has more then enough Calcium in it. Prob just getting locked out. Might be beneficial to have a mini flush to push excess though. Tips burning is a sign of to much. Its imperative to have a good wet and dry water cycle with this lineup of feed or it can get root rot easily.

Where are they on the fan leaves? I would think Calcium issue first. What is your RH?

Also Ca deficiency

Looks like lockout to me, mg deficiency. Epsom salt would be a quick fix and solution. What kinda water you using? With living soil chlorine will kill the microbes and if you use distilled your missing some nutes I think.