Orange cup coral (Tubastraea coccinea) belongs to a group of corals known as large-polyp stony corals. This non-reef building coral extends beautiful translucent tentacles at night. Tubastraea coccinea is heterotrophic and does not contain zooxanthellae in its tissues as many tropical corals do, allowing it to grow in complete darkness as long as it can capture enough food.

Tubastraea coccinea. Retrieved January, 01 2022, from en.wikipedia.org/wiki/Orange_cup_coral.