I downloaded this iPhone application just for the challenge and am now $1.99 poorer.
It is a lot of fun to play with though. It makes bubbling sounds and you can add different kinds of fish, plants, treasure chests etc. and see it from different angles. No dead fish or smell and maintenance free except for recharging every night.

The image was taken with a Fisheye lens of course.

The image above was taken for this weeks Totally Informal Transglobal "Thursday" Challenge: "Water in an abstract way".

Check out other images here