The sapphire fish is 15 to 20 cm long, with a flat oval side, a triangular head, and a slightly thick snout. The dorsal fin is elongated, with dozens of spines in front arranged horizontally, which are relatively short, and the rear soft spines are few but higher.

After knowing how big the sapphire fish can grow, let's learn how to raise the sapphire fish correctly. Sapphire fish likes new water, but can also adapt to old water, and has strong adaptability to changes in water temperature, generally not lower than 20 °C. Eat a lot. The light in the aquarium should not be too strong, the bottom of the box should be covered with sand, and more water plants should be planted. Some rockery caves can also be set up, which is suitable for the habit of sapphire fish who like to drill holes and peck sand for food.