Well, thanks you two. If neither of you use it, I think I can probably do without spending $13.95 on a tiny little bottle of hocus pocus. All that ridiculous hype on the label really put me off, I obviously didn't read it the first time I bought it.
I'll use what I have left as a root soak for transplanting, then buy another orchid with the money I saved, or two, if there's anything worthwhile on the death rack at Lowe's!
University of Florida has a big Hort/Ag program as well, of course. I wonder if I can find somebody there who has seen research on this stuff?