When people think of coral reefs, the first things that come to mind are the vast colors of the corals, the plentiful fish swimming about, and the appearance of creatures like sharks and sea turtles. While this view does an adequate job of describing what can be easily seen, it does not take into account that many things, especially on the coral reef itself, are far too small for the human eye to perceive.A new Netflix documentary called Puff: Wonders of the Reef shows the reef as it has never been seen before—examining the vast microverse that exists out of normal view. It follows the adventures of a sharp-nosed pufferfish from the time it hatches from an egg through adulthood. Like most marine life, Puff starts out as part of the plankton, growing until it settles out on the reef, using the tiny passages formed by the coral heads to hide from predators and to find food.The film provides stunning close-up photography in brilliant high definition. One event caught on camera is the coordinated spawning of the corals that make up the Great Barrier Reef. Unlike other documentaries that just show the gametes being released from the coral polyps, this one zooms in very closely to show the sperm and egg packets getting ready to be released, and then it follows them out into the water. Once there, viewers see fertilization taking place and then the transformation of the new coral in a water column. The new zygote is then shown settling out of the water, back onto the reef, hoping to find a safe place to start to grow.As Puff grows, it transverses from the coral reef, across the sand flats, to a mangrove lagoon, where it finds shelter and food. Along the way it encounters an anglerfish, sitting and waiting for its next meal. The anglerfish is perfectly camouflaged, so Puff swims right into its awaiting jaws. However, the predator soon realizes that it has captured the wrong prey, as Puff inflates its body, poking the inside of the anglerfish’s mouth with its spines. The anglerfish spits Puff out and swims off.Several months later, Puff returns to the coral reef from the mangrove lagoon. Once there, it is discovered that a lot of the corals that were once home are now gone. This leads to an explanation of how devastating climate change and warming waters are on corals. The camera actually shows the zooxanthellae being lost from the corals as a result of the warming waters. At around two years old, Puff is fully grown and in search of a mate on the reef.Puff: Wonders of the Reef covers many biology topics, including predation, food chains and the transfer of energy, symbiosis, photosynthesis, and climate change. While only the transfer of energy and climate change are covered by the Next Generation Science Standards, this film would be a great asset to any biology, environmental science, or marine biology class. It is appropriate for students in grades five and up. The film does have a few tense moments (like when Puff gets eaten by the anglerfish), but there is nothing within it that would be objectionable to most students.Puff: Wonders of the Reef is an excellent documentary that could be used to introduce students to the amazing marine life on the Great Barrier Reef, as well as to show that there is a lot more diversity on a reef than what can be seen with the naked eye.