Yes they are. The fish are for work. Tanks simply hold the fish until it is time for the fish to be displayed. Fish stay displayed for a week or less and are brought back. I have been thinking of putting them on stands recently.
Well that explains it. Get them off the floor. If you don't need anything fancy just build a 2x4 stand or even use cinderblocks. A few feet of elevation will allow the tanks to gravity drain.