Get some of the conches that grow large. Make it an invert tank. I can imagine a large fighting conch sliming around the curved glass. The magnification would be cool.
It would do nice as a part water part land type also. Cliff back wall with water fall, one side a shallow pond with frogs and lizards etc.
It would do nice as a part water part land type also. Cliff back wall with water fall, one side a shallow pond with frogs and lizards etc.