ZiG, if you're just in the rooting stage, spraying the clones with plain water should be ok (or so I've read -- I'm no expert). Before they root, you shouldn't give them any nutes.

As for little sicko, the Ph of my tap water was worse than I remember: 8.7! Has anybody ever heard of such a thing??? Sheesh. In fact, it was so high that I had to resort to vinegar. I also bumped up the SuperThrive a bit, to about 1/8 teaspoon per gallon instead a drop or two a gallon. The SuperThrive alone lowered the Ph over 1.5, and a splash of vinegar did the rest. Some people recommend against vinegar because they say it's not stable enough and your Ph will gradually creep back up. I find it's almost as stable as a commercial Ph-Down solution, at least in my limited experience, but it does require daily monitoring (which I'm doing anyway).

The PPM of my tap water was a little higher than I remember as well, about 160. But since I'm aiming for a PPM of around 1000 to 1200, it's still not horrible, and hopefully that 160 contains CaCO3, as stinky suspected.