Hippo tangs just need a tank that big to live a long and happy life but that wouldn't be the only fish you could have. Having a bigger tank would really allow you to fully incorporate finding nemo with most the fish in the movie not to mention it will be much more stable then a 30 gallon tank. It's all preference though, a 30 gal with a few clowns some coral and goby sold be cool too.
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