Dr. Bongaerts of University of Queensland’s Global Change Institute recorded a variety of reef life on the Great Barrier Reef over the course of five years.  Thousands of independent photos were stitched together into this time-lapse video below, which shows:

• Tide rising over a shallow Acropora reef
• A pipe organ coral “blooming”
• An upside-down Heliofungia sp. plate coral flipping itself over
• Another coral moving sand off of itself
• Sea cucumbers and starfish scurrying about

Other footage include this sea cucumber “sniffing” out the sandy seafloor for detritus to eat:

… and corals attacking each other with deadly mesenterial filaments:

[via Daily Mail]