Sudden leaf color change...deficiency? pictures provided....

Several possibilities:
-magnesium deficiency
-nitrogen deficiency
-lockout from pH irregularity
-lockout from a salt buildup/imbalance
-an evil pixie with a Highlighter
cn

sooo maybe flush it?

Flush only if lockout.
If a deficiency, flushing would make it worse. Could you post a pic of the entire plant and its neighbors, if any? cn

IMAG2528.jpgIMAG2529.jpgIMAG2527.jpgIMAG2526.jpgIMAG2525.jpgok here you go! hope these pictures may help decipher!!!! not sure as to what to do!

what week you in? Looks like the plant is feeding off itself you done chopped off all the fan leaves.

im in week 4 of flower for the small thicker looking plants...and yes i'm aware i did over trim =( and am suffering the consequences....it was a newbie mistake

You're gonna have yield issues with all the fans gone.
My other read is: you have enough or even a bit too much N, as judging by the burnt tips. The discoloration might be a mild cal-mag deficiency, but you won't create trouble by simply watering until the end. I don't recommend either feeding or flushing at this point. Jmo. cn

try a lime drench. there's ur Mg and possible pf being off. 1 tbsp/gal water. kill 2 birds with one stone.