I hope your not serious CoreySebae about the fish in the 29 gallon. Angels need a big tank and a tang needs at least a 75 gallon tank.
I heard a story of someone wanting to save lobster from the grocery store, so she bought it and let in go in the lake in the back of her yard. She also left the rubber bands on so it wouldn't pinch her. If your going to do something, then do it right.
I wondered about the tank in the movie too. Isn't it illegal for someone to pick a fish off the reef like that and take it home. Also, the clown wouldn't be able to acclimate that quickly to a tank. The movie tank lookes like a 55 gallon to me and there is no way they could even think of putting a moorish idol in there. Pixar should have researched that a little better.
My lfs sells perc clowns, and most of the time people come in just to look at them, kids saying that they want one. I won't buy one just because they are soo popular.