Plant isn't drinking anymore!! please HELP!

Ok so i'm 11 weeks into flowering, thinking i have 1 or 2 weeks left at most before harvesting...Got two plants growing side by side each in an aerogarden..I am still giving them nutes and after filling the tank a few days ago, I am noticing that while one of my babies is almost done drinking up all the solution, the other one hasn't been drinking at all!..I emptied the reservoir and filled it up with straight up water (ph'd)..hoping to see it drink up again..

anyone ever had that problem before?? can this be a sign that it's ready to be harvested?? the water level seems like it hasn't gone down at all and the leaves have started to turn yellow at an increasingly growing rate...

It just doesn't need as much water bro. Take away oz to cups until it starts drinking faster again. Find out the right time to harvest is after researching what kind of high you want your smoke to be. Theres tons of different methods of harvesting usually ranging when the trichomes are 50%clear-50% cloudy. 10%clear-40%cloudy-50%amber. or even 50%cloudy and 50%amber. I wouldn't harvest judging on how much water its drinking.