PetFish 3DAquarium - Version 1.20 Demo PetFish 3DAquarium is a virtual fish tank editor and viewer. You can add each fish with unique personality you select in your favorite tank environment. Realistic animation of the fish that swim in the 3 dimensional background just like real life would add relaxing atmosphere in your computing life. Your original tanks can be viewed in the desktop while you are working, or can be displayed as a screen saver.