Any reason for concern?

Peace! We are on day 13 today, and I’ve been in here gaining a lot of information and newbie knowledge! I truly appreciate all the feedback thus far… over the last few days or so I’ve noticed a little yellowing on the plants. I’ve got them planted in FFOF, FFHF, and a mix of the two. (Labeled on sticks of each plant) The trains are all auto FB= Fat Banana, NL= Northern lights, RG= Royal Gorilla.

A little background… all were germinated in soil, in 2gal pots, under a 1000w KINGLED (100w), initially I only watered around the plant itself and maybe 1-2 inches out, until recently (2days ago) I gave each pot a complete water where all the soil got moist. Temps have been in between 80-85f and RH has been around 80%, fluctuating close to 90 every now and again. From what I’ve read and researched the yellowing can be cal/mag deficiency, a lack of nutes (which seems strange seeing that they’re all in foxfarm soil). And in my own infant mind it could just be normal, what’s your thoughts, tips, advice, questions?
Thanks
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