That is a nutrient lock out for sure. Yes you need to flush your whole system.

My concern is starting in dirt then moving to hydro. You may find the roots have slime over them that is causing some of your problems. There are some bacteria in dirt that is not present in Hydroponics you may be dealing with. Smell your roots, I know that sounds funny but it works. If there is root problem you will know.

Add some hydrogen peroxide 5ml for each gallon of water even to your flush. Then add it again when you mix up your new nutrients and balance the water. Are you using tap water or RO water? Tap water will have chlorine in it and that is not good for plants.
Zandor Reviewed by Zandor on . Help with Hydroponic Problem? Hello everyone! My hubby is out of town and left me in charge of the plants. They are looking BAD and I need to see if anyone can help diagnose. The plants look droopy and I've attached pics of the leaves. The ph is ~6.0. The chamber is well ventilated and the nutrient water is on a continuous cycle through the pots. It appears to be a nutrient deficiency? Could lowering the ph help? Please ask me any questions you need to know...I'm very new at this! (The yellowing of the leaves starts Rating: 5