Abe is correct. You don't need rock or sand in a quarantine tank because in case you medicate your fish in the quarantine tank and many of the medicine will kill off bacteria on rock and sand. Even worse is that those medicine will bind to rock and sand for a long time making them unsuitable for any display tank.
A HOB filter is good and make sure the filter pad is fully cycled because that will be your main biological filter. Put a NEW filter pad in your main tank to cycle the pad and put it in the HOB.
Good decision on the quarantine tank because not many people realize many benefits of a quarantine tank.
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