We have a crew that will be visiting the tank once a week for 3 months. After that, the client is responsible for maintenance. They can either hire us for the service or find another one. They actually put on their trunks and go for a dip in tanks this big to scrub it. The sculptures are pretty easy to clean. A scrub brush takes diatoms and algae right off, almost easier than the acrylic.
The rubber reef sculptures are fabricated outside of the tank. They are dropped into the tank with a forklift, fitted into place, and then shipped out. We make the tanks, make the reefs, make the cabinets, install, fill it with water, put the fish in (weeks later), and clean it.
I'm a reefer through and through, but I still like the way some of our tanks look. I'll never own one myself, but they are still pretty sharp for fish-only showcases.
I'll have more pics as we go!