I came across this today, The Lifeglobe Goldfish Aquarium beta, it looks quite nice.
check out
http://lifeglobe.com for a demo and the latest news
It looks like its built on the Marine Aquarium2 engine but with some enhancements to the background articles etc.
3 fish and 3 minutes before it blacks out but you will get the idea.
Cant wait for it to go full version.
