Is there any issue leaving a QT just running with nothing in it? I use tank water, and top off with RO/DI water. Have a heater, HOB aqueon filter, and powerhead. I have a sponge in my display sump that I'll put in the filter before putting fish in it, then throw away when finished quarantine process. What parameters should I check before adding anything, aside from salinity and temp? Does anyone else leave their QT idle with no livestock?