Common name: Black Sun Coral

General information

Tubastraea micranthus, commonly known as the Sun Coral or Tube Coral, is a non-photosynthetic coral that is highly sought after in the reefkeeping hobby for its vibrant colors and unique growth form. Unlike most corals, Sun Corals do not rely on symbiotic algae (zooxanthellae) for their nutrition and instead feed on plankton in the water column.

This species is known for its beautiful, tubular polyps that extend outward from the base during feeding times, usually at night. The polyps can be a variety of colors, including yellow, orange, and even black, which is why it's sometimes called the Black Sun Coral.

Care

Caring for Tubastraea micranthus requires a bit more effort than for photosynthetic corals. They need to be fed regularly with planktonic foods or finely minced seafood. It's important to ensure that each polyp gets food, which can be time-consuming. Good water quality and stable conditions are crucial for their health.

Since they do not rely on light for nutrition, lighting requirements are minimal, but moderate lighting can help maintain their vibrant coloration. Strong water flow is also important to help them capture food and to prevent detritus from settling on them.

Symbiosis

While Tubastraea micranthus does not have the same type of symbiotic relationships with fish or invertebrates as some other corals, its structure provides a habitat for a variety of small reef organisms. These can include microfauna that seek refuge among the coral's branches.

Habitat

Tubastraea micranthus is typically found in shaded areas or deeper waters where sunlight is less intense, as they do not require light for photosynthesis. They are often found on reef slopes and walls, and can be seen from the Red Sea to the Indo-Pacific region.