Green Bubble Coral

Bubble Coral gets its name from the grape-like, fluid-filled sacs it inflates during the day to maximize surface area for its symbiotic algae, then deflates at night to expose long sweeper tentacles used for feeding and for stinging anything that drifts too close. That inflate-and-deflate cycle means it needs real breathing room — don't crowd it against neighboring corals, since those nighttime tentacles carry a genuine sting and will happily reach out and damage anything within range. Moderate light and gentle to moderate flow suit it well; too much direct flow will actually prevent the bubbles from inflating properly in the first place.