Looking awesome Jane!
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I'm following. Just a couple comments. You said your room was 30"x34"...and then you said 72 square feet. Are those measurements correct? Also, for better germination, I would suggest soaking your seeds in distilled water as opposed to tap water. Looking forward to some pictures.
The first thing I'd do is check PH. Most likely, you have plenty of Potassium in your nutes, so IF there's a deficiency, I would guess it's being locked-out due to out-of-range PH. You should be able to get a cheap PH tester for under $20, and I think I'll get consensus among the experienced growers that if you're gonna grow MJ, you're gonna want to have a way to test your PH.
You could always do a flush but, again, before I had you do that on my say-so, I'd rather let some of the "veterans" chime in.
If you can, I'd get a handle on measuring and adjusting your PH, and then look into giving them a good "flush" (check out flushing info in the first link). Check out the right side of this chart for good soil PH ranges. You'll notice that if your PH is below 6.5, for example, that your plants will be unable to effectively take in nutrients like Magnesium and Calcium - which they need.