Chytrak

I currently have a 30 gallon saltwater aquarium and can honestly say, a child is not going to be able to care for a marine fish. Before I got involved in the hobby, I did a lot of reading about the subject. You have to understand pH levels, salinity, temprature, ammonia/nitrite/nitrate cycles, among many other things if you keep more than just fish, such as corals and stuff. Not to mention, the movie itself does not depict the actual business of marine aquariums. I believe I read somewhere that in the movie, Nemo is flushed and he is returned to the ocean. Yeah.. right... We all know what happens there. Again, Disney is portraying humans as the "bad guy" by keeping aquariums. If you actually got to know the avid aquarist, you'd see that they actually care for their fish very well and care about the natural habitat. Like ToiletDuck said, there's so many places to start ripping apart this movie and what it does to people's perception of the aquarium hobby. If you have small children at home and have questions about saltwater aquariums, or fish-keeping in general, please feel free to ask. I am more than willing to answer questions if you want to know more. There's many other people on the boards with more experience than I in this hobby that may be willing to help as well.

Martin recommends, at minimum, a 55-gallon aquarium, an investment of at least $200 for the would-be clown fish owner.
I'm not sure if they simply forget a zero at the end of that number or what, but $200 for an aquarium setup seems a bit low. It may be $200 for the tank alone, yes, but you have to buy the stand, light hood, cover, substrate, live rocks, filter, food to name a few of the items. Just to get the tank started! I think $2000 is closer to what you would end up spending, actually. For $2000, you can get one hell of a setup on a 55-gallon tank though.