Acropora

The polyps can withdraw back into the coral in response to movement or disturbance by potential predators, but when undisturbed, they protrude slightly.

Common causes of bleaching and coral death include pollution, abnormally warm water temperatures, increased ocean acidification, sedimentation, and eutrophication.

[7] Most Acropora species are brown or green, but a few are brightly colored, and those rare corals are prized by aquarists.

They require bright light, stable temperatures, regular addition of calcium and alkalinity supplements, and clean, turbulent water.

Common parasites of colonies in reef aquariums are "Acropora-eating flatworms" Amakusaplana acroporae,[9] and "red bugs" (Tegastes acroporanus).

Flight through a μCT image stack of an Acropora coral from three views; the "arms" are mostly hollow. This coral had been hot glued onto a stone and later grew over it.
Flight around a three-dimensional object created from the data above
Close-up of a network of Acropora polyps
Acropora (Acroporidae) at French Frigate Shoals, northwestern Hawaiian Islands
A. tenuis cells of the IVB5 line and symbiosis with photosynthetic dino­flagellate Breviolum minutum ( Suessiales ) — in vitro : Symbiotic inter­actions of coral cells (b and c) and dino­flagellates (x and y). Coral cell b inter­acted with symbiont x, but did not in­cor­porate it, whereas coral cell c endo­cytosed both x and y.