There is a 180 gallon sump (with filter and heater), a valve in the bottom of the tank to empty water, a resevoir under the tank for aging water and an automated ro unit to replace evaporation. Water changes are going to be easier than with a 10 gallon tank.
Dude I would go with a school of cool barbs. Hampala Barbs are predatory, get decent sized (24"), are awesome looking, AND would make good dithers for others. Or a huge school of payara would be awesome