Bicolor blenny

The Bicolor blenny (Ecsenius bicolor) is a small, vividly colored marine fish known for its distinctive appearance: the front half is a bright yellow, while the rear half is dark blue or deep purple. Originating from the Indo-Pacific region, it has a slender body and typically grows to about 4 inches in length. This species is well-regarded in the aquarium hobby for its striking colors and is often sought after by enthusiasts for its compatibility in reef tanks.