Yes, it is! I don't know offhand where to get them, but some searches for glass fish should bring something up. I've seen plastic versions too, but the glass ones definitely look more realistic and move better. Basically what they are are glass fish with "invisible lines" (such as fishing line) going up to a glass bubble that floats on the surface. These will drift around nicely in an aquarium, or add a small aerator to move the surface enough to make them "swim" around.