These fish are believed to be one of the first ornamental species made available to aquarium hobbyists in the Western world. Paradise Fish can be found in rice paddies, streams and marshes throughout East Asia. These fish have a natural range that includes parts of Laos, Vietnam, Malaysia, China, Taiwan and Japan. Because their native habitat includes slow-moving waters, Paradise Fish should be kept in tanks with low water movement. A sponge filter or power filter with a low setting is usually sufficient.