Mauve Heart Urchin (Metalia spatagus) – Complete Care Guide

General Information

The Mauve Heart Urchin, scientifically known as Metalia spatagus, is a fascinating and unique addition to marine aquariums. Its name derives from its heart-shaped body, which is covered in spines that help it burrow into sandy substrates. This species is a member of the echinoid family and is often found in tropical and subtropical waters, inhabiting sandy or muddy seabeds where it plays an important role in the ecosystem by aerating the substrate and recycling organic material.

While not as commonly kept as other marine invertebrates, the Mauve Heart Urchin is prized by advanced aquarists for its unusual appearance and interesting behavior. Its ability to burrow and sift through sand makes it a natural cleaner, helping to maintain a healthy substrate in the aquarium. However, its care requirements and sensitivity to water quality make it more suitable for experienced hobbyists.

Physically, Metalia spatagus is characterized by its flattened, heart-shaped body and a dense covering of short spines. Its coloration typically ranges from light brown to reddish hues, blending well with its sandy habitat. Unlike more familiar sea urchins, the Mauve Heart Urchin is adapted for a life beneath the substrate, making it a unique and intriguing species to observe.

Care

Caring for the Mauve Heart Urchin requires a well-established marine aquarium with a deep sandy substrate. This species thrives in tanks with stable water parameters and low to moderate flow, which allows it to burrow and feed without being disturbed. A minimum tank size of 100 liters is recommended to provide ample space for its burrowing activities.

The substrate should consist of fine sand, as coarse substrates can damage the urchin's delicate spines. Regular maintenance of the sand bed is essential to prevent the buildup of detritus and ensure a healthy environment for the urchin. Additionally, the tank should be free of aggressive tank mates that may harm or disturb the Mauve Heart Urchin.

Diet and Feeding

In the wild, Metalia spatagus is a detritivore, feeding on organic matter and microorganisms found within the substrate. In captivity, it will continue this behavior, sifting through the sand to extract nutrients. To supplement its diet, aquarists can provide finely chopped seafood, algae wafers, or other sinking foods that mimic its natural diet.

Feeding should be done sparingly, as the Mauve Heart Urchin primarily relies on the organic material present in the substrate. Overfeeding can lead to poor water quality, which is detrimental to this sensitive species.

Behavior and Compatibility

The Mauve Heart Urchin is a peaceful and solitary species, spending most of its time buried in the substrate. It is non-aggressive and can coexist with other peaceful tank inhabitants, provided they do not disturb its burrowing activities. However, care should be taken when housing it with larger or more boisterous species that may inadvertently harm it.

Due to its burrowing nature, the Mauve Heart Urchin may occasionally displace small corals or other decorations in the tank. Aquarists should ensure that all tank elements are securely placed to prevent disruptions.

Health and Common Issues

Metalia spatagus is highly sensitive to water quality and requires pristine conditions to thrive. Poor water parameters, such as high nitrate levels or fluctuating salinity, can quickly lead to stress and health issues. Regular monitoring and maintenance of water quality are essential to its well-being.

When selecting a Mauve Heart Urchin, look for individuals with intact spines and active burrowing behavior. Avoid specimens that appear lethargic or have damaged spines, as these may be signs of poor health.

Habitat

Metalia spatagus is native to tropical and subtropical regions of the Indo-Pacific, where it inhabits sandy or muddy seabeds at varying depths. Its natural environment is characterized by stable temperatures, gentle currents, and nutrient-rich substrates. Replicating these conditions in the aquarium is key to its success in captivity.

Common name: Mauve Heart Urchin