I use base rock in my QT
. I know that if I ever had to treat it with chemicals I would need to pull the rock (and I would probably boil it at that point), but until I have a problem to deal with I want the fish as comfortable as possible and I want the bio-capabilities of the rock. I don't use live rock (no coraline, critters, etc), just some dry base rock that's somewhat "disposable". The rock held up just fine in my QT
going through hypo and really helped out with keeping the parameters in check.
The problem as I see it with bio balls is that they float. That's just a very annoying property of them!
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