Okay, the cilantro and parsley and lettuce all died and I pulled them out.
But the tomatoes seem to have recovered.
And the basil is wonderful and I'm already pruning it into my dinners.
I also planted 12 sets of herb seeds to go into the spaces and possibly the second growbed. And they're sprouting nicely.
Nitrates remain low. PH remains high. I'm treating with vinegar, but it's not seeming to change it much. I'll keep tracking it and maybe get a better water tester.