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Deeper on the reef, the planktivorous blue-green chromis (Chromis viridis) is common, occurring in large schools like anthias, which it superficially resembles. Along rich drop-offs, the pugnacious yellow Golden sergeant (Amblygliphidodon aureus) is often seen. A single good Indonesian reef can host more than 100 species.

Favorites among divers are the anemonefish (Amphiprion and Premnas biaculaeatus). These beautiful and plucky little fish will even nip a diver to defend their anemone home. (See "Clownfish and their Sea Anemone Hosts," page 46.)

Wrasses. The wrasses (family Labridae) are a large and successful family on the coral reefs. Most are small, elongated fishes, with a distinct swimming style that depends more on the pectoral fins than the tail. Many are colorful, and inhabit the shallow parts of the reef and reef flats, although some (such as the hog-fishes) are characteristic of the deep reef.

Wrasses undergo sometimes dramatic color changes as they pass from juveniles to adults. Many of these predators on worms and small crustaceans bury in the sand at night to sleep, or dive into the sand to escape predators.