The blackout ended this morning. The BGA is gone. Checked nitrates and they were at 5ppm. Dosed enough to bring them to 15ppm. I'm still trying to figure out what's causing the problem and plan to take it slow for a couple of weeks to see if I can connect the BGA to something I'm doing or dosing. There's not much of any real algae in the tank at present, just a little black spot and the usual on the back wall.
Plants made it Through the blackout just fine. The wisteria grew remarkably well during the week. Hope this is a good sign. If I can get the rest growing I think I'll be out of the woods.
BTW: Thanks for the spell checker Rex. Works great.