First time grower leaf problems

[Intoit]

I’m a first time grower and very close to the end of flower. I’m seeing brown/rust spots and some leaves presenting yellowing veins. My research tells me it’s either a fungus or nutrient deficiency, just not sure which one it is. I’m using biothrive bloom 2-4-4 organic vegan nutrients approximately 1tsp per half gallon water every other watering cycle. Any advice would be greatly appreciated, don’t want to lose her after all we’ve been thru!

 

[TripsRabbit]

Have you checked for spider mites?

 

[TripsRabbit]

It looks overwatered and either potassium or magnesium deficiency.

 

[Intoit]

Have you checked for spider mites?

Yeah no bugs that I can see.

 

[Hookcash87]

Here's a chart for you