in doing my research I’m halfway deciding on starting with zoanthids. Have a reefer 250 display tank and 2 QT tanks one for fish one for corals. Nothing is setup or cycled as of yet. I was curious as to Adding a fish to the coral Qt tank which will one day become a frag tank I would imagine. It’s a 20 gallon innovative Marine I believe the footprint is Around 24” x 13 x not sure of the height off hand could be 13” as well. So my question is on adding a fish once cycled to keep the cycle going while it’s empty. Any recommendations ?