The blue fish named Dori in the movie Finding Nemo is a Regal or Hippo Tang. These fish do not do well in tanks as small as yours (they need at least a four foot long tank in the range of 90 gallons or more for long term sustainability). You are wise to stick with Clownfish and Damselfish as you learn about the hobby. Both of these species are fairly hardy and inexpensive.
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