pH control for DWC bucket

Your using organic nutrients. These are more difficult to use in a hydro system as they are bacteria that help break down nutrients into what the plant can absorb. From what I have gathered( did a bit of research as I want to eventually switch ) is you need to start your nutrient mix with aeration for 24-36 hours, until it has foamed up and subsided and then add it to your bucket. Also you have light leaks with the blue tubing so going organic you have a higher chance of getting root rot and its more difficult to treat. Get a pvc pipe with and end cap to slip over them ). Temperature could also be contributing to your PH rising. You want to keep it in the 65-70 F mark. If its above 70 then the bad bacteria will thrive in that as well. I would recommend going to a salt based nutrient( not organic )