When I was in high school I read about research at the University of Hawaii in small scale self contained ecosystems. The idea fascinated me so I started doing research on how I could build one. In Des Moines, Iowa, where I lived, there is a small rain forest contained in a geodesic dome called the Des Moines Botanical Center. A scientist at the center helped me with a design for a miniature version of the center with the addition of a cave environment below the terrestrial and lake environments. My design, which I built with help from my dad, was a Plexiglas dome mounted atop a box with a cylinder in the middle that served as a lake environment. The idea was to support three mini-ecosystems in one small enclosure - a terrestrial environment, a lake environment and a cave environment. I was successful with the first two but had trouble with the cave environment because I didn't have access to any caves from which to harvest the cave animals, fungi and bacteria necessary to build a cave biom.
A few years later I designed a new system consisting of a much larger dome atop a cylinder atop an octagonal pyramid. Inside were cascading fresh and saltwater waterfalls. Unfortunately when I priced the design it came to $18K, which I couldn't afford on a 16 year old's grass-cutter's salary. To this day I remain very interested in the idea of aquaponics and self contained ecosystems that are both functional and beautiful. Right now I'm concentrating on growing our software development and design business, but for my next venture I'd like to build aquaponics sculptures that bring small scale aquaponics into more people's homes. Perhaps the various biomes (saltwater, freshwater, terrestrial, cave, bog, etc.) could be like lego pieces that people put together in unique configurations to create their own little biosculpture worlds.
On a somewhat related note, here is my latest water garden creation. It has three terrestrial plants, eight seaweeds, catfish, loaches, guppies and two types of shrimp.