Plerogyra sinuosa

Plerogyra sinuosa is a species of "bubble coral". It has grape-sized bubbles which increase their surface area according to the amount of light available: they are larger during the day, but smaller during the night, when tentacles reach out to capture food. This species requires low light and a gentle water flow. Common names for Plerogyra sinuosa include "grape coral", "bladder coral", "pearl coral" and "branching bubble coral".