First Time Grow White Widow Auto 6 Plants DWC

Hello hello ILGM forum’s. First time grower here, looking to share my current process and I’m sure ask questions along the way.
So i’ve always been passionate about weed, and decided to embark on the journey to create my own. The new area im in has a perfect climate for indoor and outdoor growing I believe. So anyways onto the goods.
[Quick setup info]
Vivosun 4x4x7 Tent and 6" Duct fan + filter
6x DWC Individual Buckets
Mars Hydro TS3000 450W LED Light
VIvosun hydrometer and temp monitor

Flora Trio
Cal-mag (havent and probably wont use)

Started the grow off with 6 White Widow Auto’s using the water soak germination method. 5 out of the 6 germinated in water, the 6th was placed into a starter plug and just left in darkness for approx a week.
(4/22/22) After about 5 days of letting seedlings grow in starter plugs and cups I transplanted them into there new DWC containers.

So first dose of Nutrients went in 2022-04-22T04:00:00Z
Between 1/4 to 1/2 of recommended Flora trio dosage in first feeding
A day or so later I encountered my first issue, still dont officially know what it is or was. But I knew it couldnt be good, so I did a full scale bucket rinse and light hydroton rinse, did not remove medium as I did not want to disturb plant roots anymore. (Almost certain the fungis or whatever was growing was my own fault due to poor hydroton cleaning and also not rinsing all the organic matter off plugs before transplanting into DWC

So. FF to 2022-05-06T04:00:00Z
Emptied reservoirs and changed nutes between 5-2-22 and 5-4-22
Picture shows nutrient amounts added
So onto my biggest concern at the moment, I checked the PH values and inspected each plants roots on 5-5-22, saw all the buckets PH had fluctuated a good bit, I rebalanced the water on all as close to 6.0.

Plant A looks very healthy as far as I can tell. So I guess my question is, the color of the roots normal? Is that just from the nutrients, perhaps the Micro? (very dark and almost viscous) Or maybe is this the beginning of Nutrient lockout? Trying to be proactive, any tips would be great!
Thanks, will keep this thing updated through the grow :grin:

Oh and here is a quick pic as of 2022-05-06T04:00:00Z

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An updated pic,