Hello, went through your grow so far, looks like nutrient lock out has been a major problem on the hydro side. When peroxiding to control bacteria, contact with organics sets off the radical that causes a major drop in the pH of the water to around 5.2-5.5 I did extensive studies on this years ago when I was growing hydro ebb and flow system. The chlorine effect is the same on contact with biologicals, when you feed more nutrients into that same water, this helps the bacteria more than the plant, over 72 hours the chlorine smell goes away and the war starts all over again.
You can save your hydro grow, it will take some research and hard work on your part.
Check this out if you get a chance. https://overgrow.com/t/the-mysterious-ph-fluctuation/9760