I think I want to stay away from anything more than what's needed by most everyone else. Usually that's GH FloraNova + CalMag in the case of mine being RO water.

I *did* look at both sides of an affected leaf with a microscope and show no signs of any pests, unless it's a fungus.

I seriously hopes it goes away. And here, I thought it was e-z to go hydro. I wonder if this first attempt is atypical? I mean, everything seems to have gotten into the right range... PPM, PH, etc - also, as I said, the temps have been getting up to 77, 78F in the res. If those temps keep up, I wonder if that will seriously affect the plants.

I have an AC unit in there but I think it needs a fron recharge or something. It's only blowing in the air from the outside without much if any temp change.