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My guess would be a PH issue. Run down to your local hydro store and pick up some liquid ph tester and some ph up and ph down solution. Should keep the PH around 6.5 A little while after you fix your PH you could probably start adding some nutes.

Really looks like a ph issue to me. If you leave your water supply sitting for a few days I've noticed, at least in my case, that the ph will change and will lead to nutrient lockout. Try to get to your local hydro store and pick up a ph reader (or a cheaper option there is liquid ph tester for...