Doug,
No substrate, was not aware of that. I have never used a quarantine. The tank is currently bare bottom though so it would be much easier to leave it that way.
Now that I am moving to a larger tank and full blown reef I can't risk a crash from a foolish introduction so the quarantine is a must. So no substrate eh? Just sterile hiding places, some good water movement and a means to use AC to remove meds if needed. Also remember this is not a hospital tank as such, it is a quarantine/ introduction period tank. Though it would be were individuals will be treated if meds are needed, though I shy away from meds if possible.
-Erik