The real aquarium is an amazing free live wallpaper of caribbean fishes for Android. It has differents backgrounds of corals and typical ocean's scenaries to be choosen.
Also, this live wallpaper has bubbles and light effects.
It has cool graphs and It has a very low battery consumption.
Try it and you will not regret it!
first you have to download it, then: home -> menu -> wallpapers -> live wallpapers.