Yes…100% Water needs to be in ther range I taught you, otherwaise, you roots will turn to mush…Easpecially in ebb and flow.
I gotta tell you. Noob you are doing this the hard way. I wish I could get you into using a more acceptable hydro system.
Your lights appear to be too weak or too far away, without even knowing what they are. I can tell Your plants are tall and stretched. Do not take offense. I am going to always be honest and tell you what I see. If you want to grow using hydro method, you need to upgrade your vessel which are entirly too small, and inefficient.
What medium is in the cloth pots I see? Let me know. I believe you need to settle on a way to grow, a better system, and stick with it. Whether it is hydro or not.