They did that on TANKED< the show on Animal Planet.The people create AMAZING acrylic aquariums at hundreds of thousands of gallons.
Here is the link to their page, be sure to check it out!!!!!!
LOOK AT ALL THOSE AMAZING TANKS!!
They first come up with a design, make the acrylic and molds and decor, add substrate, water, filters, heaters, and air bubblers and then they go pick out their fish from their PERSONAL collections. It is AMAZIng!
They do saltwater, freshwater and brackish.