Thanks for your insight Texas & Bongo. That's exactly what I was unsure of, so I'm glad I know now...instead of finding out by default about 3/4 of the way through flowering. And Texas, I add peroxide periodically for exactly what you mentioned, just to get a few extra oxygen molecules to the roots. But since I really don't know how much of a difference this is making, it won't be a problem to just stop using it when I start with the flowering ferts.

Again, thanks for your responses.