Blue star fish can grow to 10-15 cm in size, and it is necessary to ensure a healthy diet and water quality when feeding. The blue star fish is tall and flat on the side, with a long arc from the chest and abdomen to the end of the caudal peduncle. The pelvic fin filaments are thoracic, the anal fin is correspondingly anterior, the fin base is extended to the base of the caudal fin, and the caudal fin is short and slightly forked. The whole body is blue-gray, with three large black spots behind the operculum, the middle of the trunk and the caudal peduncle. The fins are pale yellow. During the breeding season, the anal fin has a broad orange-red edge.

The most suitable water temperature for the blue star fish to live in is 22-26℃, which has no effect on the water quality. special request. The folded gills can use the oxygen in the air, so there is no need to worry about the lack of oxygen in the water. Omnivorous, feeding on fish and insects, water earthworms, dry feed, shrimp and crab seeds. The blue star fish likes to be quiet and not to move. Therefore, it is not suitable for polyculture with active fish, such as zebrafish.