I've never heard of a betta being in a heated tank unless it was with other fish, it's extremely common. I think your missing my point that the vast majority of betta owners aren't going to put a heater in a betta bowl. They can live years without. Working with customers has shown me that perfect fish keeping isn't always on the top of the list and not completely necessary, realistic and optimal are very different from one another. There is leway here and imo a heater isn't necessary for proper care, optimal though not required.
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