growing purple kush in promix. using floranova bloom for nutes. Ok am currently at day 29 of flowering on my first grow. I water every other time with straight water. Wednesday was straight water thursday night I noticed the plant directly under my light looked yellowish green top to bottom. Today I noticed 3 more are doing the same. I am still new to this and havent a clue what is causing this. Thought maybe the lights too close so I raised it up some. But it was like 18" from the tops and is a sealed hood and doesnt seem to be all that warm above the plants. Temp is mid seventies in the room. Is it possible that I flushed all the nutes out and the plant is suffering after two days? I dont want to hit it with more and end up burning them up. I also dont want to flush them unless needed and end up rotting the roots. Its not the common bottom fan leaves dying out but all the leaves turning yellow and some falling off. Sorry I dont have pics maybe I can borrow a cam and take a few tomorrow. Dont know what else to include to help diagnose. Thank you for any help I am getting worried.