Common name: Crater Sea Squirt

General Information

The Aplidium crateriferum, commonly known as the Crater Sea Squirt, is a fascinating and somewhat overlooked species within the marine aquarium hobby. This colonial tunicate is known for its vibrant coloration and unique filtering abilities, making it an interesting addition for aquarists looking to explore beyond the typical fish and coral setups.

While not as prominent in the pet trade as some other marine species, Crater Sea Squirts are valued for their role in maintaining water quality through their natural filtration process. They can be found attached to substrates in their natural habitats, where they form colonies that can cover significant areas, contributing to the ecological balance of reef environments.

Care

Crater Sea Squirts require a well-established aquarium with stable water parameters. They thrive in environments with moderate to strong water flow, which aids in their feeding process by bringing plankton and other organic particles within reach of their siphons. As filter feeders, they do not require direct feeding, but benefit from a nutrient-rich environment.

Due to their sensitivity to changes in water quality, they are best suited for experienced aquarists who can maintain pristine conditions. Their presence in a tank can indicate good water quality, but they can also be an early warning sign of deteriorating conditions if they begin to decline.

Diet and Feeding

Crater Sea Squirts are non-selective filter feeders, drawing in water through their siphons and extracting plankton and organic particles. In captivity, they benefit from a well-balanced marine environment that supports a healthy population of microfauna. Supplemental feeding with phytoplankton can enhance their growth and vitality.

Behavior and Compatibility

Crater Sea Squirts are peaceful and can coexist with a wide variety of marine species, making them suitable for community tanks. They do not exhibit aggressive behaviors and are generally unaffected by other tank inhabitants. However, they should not be housed with species that may prey on them or outcompete them for food.

Health and Common Issues

Crater Sea Squirts are sensitive to poor water conditions and require stable, high-quality water to thrive. They can be affected by sudden changes in salinity, temperature, or pH. Regular monitoring of water parameters and maintaining a nutrient-rich environment are essential for their health.

Selecting a healthy specimen involves looking for vibrant coloration and active filtration behavior. Signs of distress include closed siphons and a lack of response to water movement.

Habitat

Aplidium crateriferum is typically found in temperate marine environments, often attached to rocky substrates, docks, or the undersides of boats. They prefer areas with strong water currents that facilitate their filter-feeding lifestyle. Their natural distribution includes various coastal regions where they contribute to the biodiversity and ecological balance of the local marine ecosystem.