Can you keep Siamese Fighter Fish in jars, pint glasses, vases or small pots?
The real question is, why would any responsible fishkeeper want to? Betta Fish, in certain parts of Asia, are culturally kept in jars or very small containers, in collections, or often for cruel sport purposes. Some supermarkets in the USA sell them on shop shelves in small pots, often with less than a litre in them, which really isn't cricket.
While yes, Betta's have adapted to these habitats, it's really not ethical to keep them in anything smaller than a 15L aquarium, which is well-filtered, with plenty of environmental aspects to interact with (plants etc) that will not harm, stress or depress your fish.
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