Here are the nutes we are currently using. It is the "Recipe for success starter kit" by technaflora plant products ltd.
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I use the same line of nutes, mostly because I am not a chemist and they are easy to put together but also, I've found that the Technaflora line is pretty cost-effective. They don't give you enough Sugar Daddy in that starter kit, and you need to really reduce the amount they recommend on their recipe for success feeding chart, but I am pretty happy with this line. I generally don't go higher than 3/4 strength on their recipe and with the autos I am currently running, I haven't taken it higher than 50% strength.
How often do you check your PH and PPM/EC?
Are you finding that having a multi-site res is causing your smaller plants to get crowded out of the light by the bigger plant? What do you plan to do when your big plant needs Bloom recipe while your little one still needs Grow recipe?
On my first run with DWC, I started out in 18 Gal totes and ended up switching to 3.5 Gal buckets because of the different nutritional requirements each of my 4 plants needed. I also did 3 different strains, but even the 2 plants that were the same strain were different Phenos, so the multi-site tote res just didn't work for me. Now if I had clones all from the same mother plant, the multi-site res could have worked because all the plants would be genetically the same and have the same phenos and nutritional needs.
Something to think about as you go forward and as your plant gets deeper into the flowering process.
Also, I noticed your roots had some nutrient stain. Not a big deal, but I get concerned about any darkening colors in my roots, as I have seen via research all sorts of things cause serious root issues. The one thing I add to my res that seems to take care of this is a liquid composting solution made by Botnicare called "AquaShield". Aquashield contains a number of beneficial microbes which feed on harmful microbes that lead to root issues, including root rot. I am not saying you are headed for root rot, but you know the saying....an ounce of prevention is worth a pound of cure. I highly recommend using 2 tsp per gallon of water of AS adding some every 7-10 days.
Looks like your first run is coming along nicely. The love you are showing your plants is there for all to see.