How many tanks, including your QT are up and running right now - don't count the ones in the garage or the back of the closet - only tanks that are holding water and up and running at this moment.
6 including the QT (4 FW main tanks, one SW main tank and one QT {FW right now})
6 including the QT (4 FW main tanks, one SW main tank and one QT {FW right now})