What kind of freshwater fish should I get?

After my hamster dies,I plan on buying a new tank and raising fishes.I like the color blue and fishes that won't make me bored.I also like fishes that always do something.My tank size is 5 or 6 gallons.(I didn't buy the tank yet.I'm thinking about getting a 5 or 6 gallon tank.)Thanks.
 
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