You decide whether you want to see bubbles or the water surface from your view. You can only put in 12 different fish in a tank at any time (even with the full version). Fish include Percula clownfish, Ocellated Dragonet, Blackbar Triggerfish, and the Tricolor Fairy Wrasse. This is a marine aquarium set up that gives you a ton of options so you can set up your aquarium just the way you want it. Sim Aqarium Free Tank 2.31 by Digital Illusions Software lets you choose from 41 different fish and five different tank views (okay, 4 tank views and one plain sandy bottom).The screensaver is available from cnet's here. If you like it, the full version is $19.95.

This is another one of those try before you buy applications. This screensaver displays a digital clock for you. You can also decide if you want to hear waves or bubbles. You can control the number of fish and bubble action that you want to see. For the freshwater aquarium, you can choose from a barb, angel fish, discus, Red Oscar, and a red Platy. You can choose from 5 different saltwater fish like Butterflys, Tangs, Angels, Clownfish plus you get to add planktons and starfish.

3D Fish School Screensaver by Gelios offers you choices! You can pick from a saltwater aquarium (3 different views), freshwater aquarium (3 different views), or the ocean floor to look at.

If you want the Mac version, go to the LifeGlobe site. This screensaver is available from cnet's here for the windows version. This site, has details on each goldfish! With the free version, you can only display one goldfish at a time. They have cute names like Elton, Minnie, and Oreo.

You get 12 different goldfish to choose from. Goldfish Aquarium 1.0 is another favorite aquarium program by Prolific Publishing.This screensaver is available from cnet's here. Choose from butterflyfish, damselfish, angelfish, lionfish, tangs, and even a Picassofish! You can buy a version of this for your pocket PC, too so you'll never be far away from your tank! Prolific Publishing actually makes another screensaver called Sharks V1.0, Terrors of the Deep, which while technically isn't an aquarium, might hold your interest as well. You can pick from 26 different fish but you can only display 3 fish at any time using the free version. If you decide you want to buy it, you pay $19.95.

Marine Aquarium 2.0 is a top rated aquarium program by Prolific Publishing.

Best aquarium screensaver