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Hi Nevada,
You can't believe what you hear always in a pet store. Most of them are just trying to sell you more and more, and if the fish die quick, well then you'll end up buying more, won't you?
My 2 male bettas live in a 10 gallon divided tank. One on each side of the divider, planted, heated and filtered. They live alone in each half. My 3 females live in a 46 gallon community tank with other fish.
They don't need huge homes (2g is probably a minimum...). BUT... imagine you living in your toilet bowl with occasional top ups of fresh water. It just isn't right. When you think about it that way, regular water changes OFTEN is obviously the right thing to do.
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