Common name: Green-ringed Ascidian

General information

The Chalice Coral, scientifically known as Sigillina signifera, is a species of stony coral that is highly prized in the reefkeeping hobby for its vibrant colors and unique growth patterns. These corals are part of the family Pectiniidae and are known for their plate-like or encrusting forms that can add significant aesthetic appeal to any reef aquarium.

Chalice Corals exhibit a wide range of colors, including blues, greens, purples, and pinks, often with contrasting lines or spots that make each individual coral distinct. They are moderately challenging to keep, requiring stable water conditions and careful attention to lighting and flow.

Care

Sigillina signifera thrives best under moderate to high lighting conditions with a combination of blue and white spectrum LED or T5 fluorescent bulbs. They prefer moderate water flow that is not too direct to prevent damage to their delicate tissue. It's important to maintain stable calcium, alkalinity, and magnesium levels, as these are crucial for their skeletal growth.

Feeding is not always necessary for Chalice Corals as they possess zooxanthellae, symbiotic algae that provide them with nutrients through photosynthesis. However, supplemental feeding with microplankton or coral foods can promote faster growth and more vibrant colors.

Symbiosis

While Sigillina signifera does not have any specific symbiotic relationships akin to clownfish and anemones, it does benefit from the presence of cleaner organisms such as certain shrimp and snails that can help keep its surface free from algae and detritus.

Habitat

Chalice Corals are found in a variety of reef environments, typically in shallow to mid-depth waters where they can receive ample lighting. They are often seen on reef slopes and overhangs, where their plating growth form allows them to capture light efficiently.