Heteroconger hassi, commonly known as the Spotted Garden Eel, inhabits sandy seafloor regions of tropical reefs. Known for its unique behavior of burrowing with only its head exposed, it feeds on plankton swept by ocean currents. These eels live in colonies, creating a mesmerizing sway with the ocean flow.

Heteroconger hassi, commonly known as the Spotted Garden Eel, is native to the Indo-Pacific region. Its geographical distribution includes the Red Sea and the Western Indian Ocean, extending to the Pacific Ocean, covering areas including the Great Barrier Reef, and the waters around Japan, Indonesia, and the Philippines.

Spotted Garden Eels typically inhabit sandy substrates in coral reef environments. They are found at depths ranging from 5 to 45 meters (approximately 16 to 148 feet). The water temperature in these regions is usually warm, ranging between 22°C to 28°C (72°F to 82°F).

Heteroconger hassi is known for its unique behavior of living in colonies, with individuals anchored in burrows. They feed on plankton that drifts by, extending their bodies out of their burrows to capture food. This species plays a role in the reef ecosystem by contributing to the sand turnover and providing a habitat for other small organisms.