Everything everywhere says 5.5-5.8 ph is ideal, is that incorrect

[TDubWilly]

@Kurecannabisco

It’s looks like a calcium issue to me

Looks like it to me too, and i think it is, but it’s not always 100% obvious.

Possible leaf septoria, which I doubt, or even a fungus known as Rust.

Rust Fungus,CalMg,pH? Outdoor Cannabis Grow

https://study.com/academy/lesson/rust-fungus-definition-life-cycle.html

Rust looking brown spots on leaves

@cmichphoto Welcome ti ILGM. Here is what I believe it to be Rust is a fungus problem that can affect nearly every green and leafing plant. It’s descriptive, rusty name comes from the reddish, brownish or yellowish color that it causes the leaves to turn, and also for the spores that appear powdery and will rub off on anything that touches the affected leaves and will spread on the slightest air current. Controlling rust and curing plants affected is simple. Remove Infected Leaves and Stalks …