Okay, please don't judge me on this poor cactus. I swear I do my best with it but, yeah, it's not going well. I can't even figure out if this is rust fungus or if it's spider mites damage. What do you think is going on here?
Watering when the soil is dry (more or less every week or 2 weeks at this time of the year). It is located near a west window.
by HibiscusGrower