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Siamese fighting fish (Betta splendens) were housed individually in and rotated between jar (1.5 L; three small surface plants and pebbles), small (3.3 L; one medium plant and pebbles), medium (5.6 L; one medium plant and pebbles), large (19.3 L; one large plant, pebbles and one barrel for refuge), and large-barren (19.3 L; no plants or furnishings).
