Top 7 Popular Fish You Should Try in a 20-Gallon Aquarium

Learn about our top 7 favorite freshwater fish to spice up your 20-gallon fish tank with their beautiful colors, interesting behaviors, and breeding.
20-gallon aquariums are one of the most popular tank sizes among fish keepers because they’re small enough to keep in a bedroom but big enough that you can choose from a wide variety of fish to keep. With all these possibilities, check out our favorite freshwater fish to spice up your aquarium with their beautiful colors and interesting behaviors.

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