m0useanswered grow question 5h ago 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.