That's nothing. Look at this horrible tank I found on youtube last night. http://www.youtube.com/watch?v=bMR-nMJGGXA It's not much bigger than 30 gallons and I see two Moorish Idols, a few angels, 2 butterflies, a pair of clowns, etc...
For some reason there's a persistent myth that Moorish Idols are hard to get eating. They aren't. The challenge is providing proper long term nutrition.
The Idols fight nonstop though. This person posted tons of videos. He even titled them "Moorish Idols fighting". Why would someone want to show that off? That's not special, that's stupid.
Also if you look at the butterflies, they look very stressed. Their colors are way off. Even the idols' colors aren't up to par.