It looks like its lacking cal-mag due to low ph. When the ph drops then the plant cannot take in and utilize cal and mag. However since you are at the 2 week flushing point then this is somewhat normal. Let that plant finish up with plain water so the plant can use the rest of the nutrients that are in its system. good luck.Whats it look like to you. I'm only 2 weeks from harvest need to keep her going until then. I have only "flush" watered once with Plain Ph'd water, to begin my 2 week flush before harvest. Not a bug problem, maybe ph spotting?