evil eye. never see this before, google yields nothing

This is a Pk issue. Adjust your PH and add extra boosters for early flowering the stage you're in now is when PK & mag + micros are needed. Sugars are also beneficial.

The dark spots are likely low-p or P being locked out. refer to mulder's chart and recent fertilization ratios. That round spot -- drip something on the leaf? That's definitely not fertilzier related - dripping fertlizer on it being categorized as 'non-fertilizer' related, lol. Keep an eye on it. If it grows, it's some sort of infection, maybe. If the damage remains the same, i'd wager it was something physical like a drip of fertilizer frying it. Knowing how it progressed would help eliminate possibilities. if it just showed up out of the blue and is unchanging in shape/color, more likely physical damage than something you fed. pic 3 of 5 looks like it may have a colony or 2 of WPM. Tough to be certain from that picture. If those white spots can be rubbed off or 'grow,' i'd be concerned. The first picture -- the red is just senescence or cold temperatures - Autumn colors are caused by this outside, and inside is no different.