The blue devil fish is a sprightly, energetic fish that attains a length of about 4.5 inches. Its body colour is mainly dark grey to purple with rows of brilliant sapphire blue scales running along the body, and there are sprinkled high-lights of the exact same colour on the head. The tail and tips of the unpaired fins are yellow.
These fishes are greatest kept singularly, but if other fish are included great refuges should be supplied.