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Best Answer: Usually common Betta's are very cheap. Ranging from $2.00 to $7.00, but they're are two very expensive breeds. The Western Blue devil is around $600.00 and the Marine Betta is about $70.00.
Tank size is important. When adding fish to your betta tank, please remember an important general rule: your tank should have one gallon of water per inch of fish. If you have a five-gallon tank, you can have up to five one-inch-long fish in it for optimal living conditions.