The Big Al's LFS
uses something similar down here in FL for their plant display. Granted their tank is probably about 200 gallons broken up into about 10 sections. Five to a side cascading down from tank to tank, dropping a few inches per tank. I've seen a circular version in other stores that uses spokes radiating out from the center to divide the sections.
Pretty much the only trick is that the outer tank walls need to be about an inch taller than the dividers between the tanks. Each divider about an inch or two lower than the one above it. The bottoms of all the ones I've seen have all been flat, so each tank is a little smaller than the one above it. You might be able to stair step the bottoms too, but it'd get trickier real quick. The main problem with doing the bottom would be making a stand that would support the whole thing evenly without putting stress on the joins.