I am still unclear on many things. I see that you call yourself a newbie, it's OK if you don't know everything, but the questions being asked are important to get to root cause. If you don't know the answer or don't even understand the question, that's cool just ask for clarification. Blowing past the questions is just going to get you guesses as help. The more you give, the better your results will be.
What does "have not done PK yet" mean?
All canna nutes does not help much. Even canna aqua has 2 different sub types - Flora and Vega
CANNA AQUA nutrients are made in such a way that the plants regulate the pH themselves. Keeping the pH in the nutrient reservoir within the optimum pH range is therefore very easy with CANNA AQUA nutrients.
www.cannagardening.com
I've never used any of them, so being specific really is a requirement. If we are going to spend the time looking this info up to help you - please make it easy on us to do it. Link to exactly what you are using is the right way to go.
Going back to the no PK thing, are you saying that you have not ever added P or K to your system? What chart or feed schedule are you using?
So this confused me a bit more. We may be mixing terms here, I believe that all of your pots are plumbed together and you have some sort of pump pushing water thru the whole system. But I still don't understand your system. Do you have a res? is there a feed at the top of the bucket that flows out at the bottom and returns to the res? I just really don't get the plumbing. Is this a DIY system?
Source water PPM and PH?
What does PH is 6 but rises too often mean? PH is 6 coming out of the tap but rises over time? Like how much and how fast?
Active bubbling / aeration? How much?
What is wc?
I don't understand your system / plumbing, so I don't understand this reply. What separate feed tanks? Each nute? Like what, N, P K individually? Please take some time and fully explain your nutes, how you are mixing them, how you are adding them, etc and explain it like we do not know what you are doing at all because we don't. Give us your entire nute regimen with as many specifics as you can.
Live means that you are adding beneficial microorganisms to the water which are synergistic with the plants but also out compete bad microorganisms like the ones that cause root rot.
Sterile means that you are continually killing off microorganisms in the water using (typically) H2O2.
You have to pick a method to control what is happening in the root zone, or you will be inviting whatever is out there to move in and take over. This could be pythium for example, which is what causes root rot and will kill your plants left unchecked.
Root Rot
Typically H2O2 is used over chlorine if going sterile because it also boosts O2 in the root zone which is a plus. Bleach does not.
An example of a product for running a live res is
great white
Great White contains a blend of endo & ecto mycorrhiza, beneficial bacteria, & Trichoderma to enhance water & nutrient uptake. Buy now!
plantrevolution.com
I see some severe issues with nutes showing in your pictures. Knowing if this is lock out, deficiency, wrong proportions, too much - whatever - I would only be guessing because there is so much I still don't understand about the situation.