20 gallon Long is the perfect size tank

20 Gallon Long Tank Divider. This tank divider is perfect for Betta fish tanks. The divider will not work in a rimless tank unless siliconed in

Lifewithpets 20 Gallon LONG Fish Tank Divider (No Suction Cups Required)

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20 Gallon Long Tank Divider Premium Package.

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20 Gallon LONG or 29 Gallon Aquarium Gecko/Arboreal Conversion Kit

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20 Gallon LONG or 29 Gallon Aquarium Gecko/Arboreal Conversion Kit