If you treat the main display tank with chemicals (even if you take out the rock), don't you still have to figure out how to get those chemicals out of your main display tank? That is, you'll probably want to flush the main display tank once everyone has been treated, that means moving them into a temporary hold while you do the flush? I would go with getting a larger used tank for QT'ing, or use your current display as a QT and buy a new tank for the main display :-)
|