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I have kept bettas for many, many years. I have kept them in everything from a 3 cup container to a 10 gallon aquarium. In fact, when I was a teenager (many years ago) I bred them with much success. I love bettas because they are such an easy fish to have. They will do well in a small container with no filtration, however, you do need to keep the container clean out regularly and make sure you use clorine remover or water that has had a chance to sit in a container overnight. The best food I have found to use for them is the small pellet betta food. The flake type tends to cloud the water faster. I even had a betta that would come to the surface and take the small pellet from between my fingertips.
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