Tripneustes gratilla | S

Tripneustes gratilla, commonly known as the collector sea urchin, is a popular choice for marine aquarists seeking a natural algae control solution. This small-sized specimen is well-suited for established reef tanks and offers both aesthetic appeal and functional benefits.

Care and Husbandry: Tripneustes gratilla requires a mature aquarium with stable water parameters. They thrive in tanks with a minimum volume of 75 litres (20 gallons) to provide adequate space for grazing and movement. A varied diet consisting primarily of algae, supplemented with dried seaweed (nori) or specialised urchin foods, will ensure optimal health.

Compatibility and Reef Safety: This species is generally reef safe, posing minimal risk to corals and sessile invertebrates. However, care should be taken when housing with aggressive fish or invertebrates that may harm the urchin. Their spines provide natural protection but can be damaged by rough handling.

Environmental Requirements: Moderate lighting and moderate water flow are ideal to mimic their natural habitat. Placement should allow access to algae-covered surfaces and avoid areas with excessive current that may stress the urchin.

Regular monitoring of water quality, including stable salinity, temperature (22-26°C), and calcium levels, will support healthy growth and longevity.