Ah yes, I have this screensaver also. The fish are indeed customizable, but there are 4 (or 5) preset tanks (i.e. Dutch style, Iwagumi style, etc).It seems that the fish are customizable (species wise) but the tank is not. I assume that you can pick different pre-designed "tanks" for the virtual fishes.
The fish look like they act pretty real in the video. I think I have seen this screensaver before... but I know I have seen other ones like it.
:icon_lol:I wonder if it simulates algae attacks?