While it visually looks cool, I honestly get a little discouraged when something like this surfaces. Most people knowledgeable about clownfish know while there may not be constant fighting, they are likely stressed quite highly (just the shear density of fish, let alone mixed clowns). Even breeders that grow out a single batch in a large tank will have a few fish get picked on heavily until they die. I'm guessing if you were to ask how many dead fish are pulled out from the tank (and they answered honestly), there would be a non-insignificant number daily - or at least weekly. Furthermore, the worst thing this does is display to the public the supposedly acceptability of jamming too many clowns/fish into a single tank. Next thing you know, we get newbies on here asking why three of their 7 clowns they bought last Saturday and put in a 10 gallon tank are already dead. (similar to newbie reactions of Mobert's sticky thread) I fully support public institutions displaying aquatic animals/biotopes and bringing more knowledge base to the general public, but if it is at the sacrifice of potential misinformation and misdirection to acceptable living and health conditions of the fish then I seriously question the decision-making process behind the exhibit. If color and flash is what you want - do computer animations, don't subject animals to this.
(stepping off of my soap-box now)