From what I understand, and will need some experts to correct me if I'm wrong, but hypo will kill off all your little tube worms, feather dusters, pods
, bristle worms, etc... And I think it might even have a chance of killing your BB. It would leave pretty much nothing alive besides your fish. Your best bet might just be to browse Craigslist or something for a small handful of used tanks for your QT tanks. I think hypo might even kill off all of your coralline algae too.
Once again, I could be wrong on a few points, but I do know it will kill of any living thing in the tank that's not a fish.
Good luck! And keep us posted on your results.