Chaetodon unimaculatus also commonly referred as the Teardrop Butterflyfish is recorded from the Western Pacific. To be found from East Africa to the Hawaiian, Marquesan, and Ducie islands, north to southern Japan, south to the Lord Howe and Rapa islands; throughout Micronesia.
The lower sides of the Teardrop Butterflyfish are white. There is a black spot on the upper side and a black bar passing though the eye. A black line crosses the caudal peduncle and the adjacent dorsal and anal fins. The dorsal, anal and ventral fins are yellow, Caudal fin is transparent. Juveniles are identical to adults in coloration.
Chaetodon unimaculatus diet includes hard and soft corals, marine invertebrates and filamentous algae. As with all of the obligate corallivore Butterflyfishes, it should be left on the reef unless an expert aquarist can somehow meet its dietary needs.
Butterflyfish are not recommended for reefs as they will pick at or eat a wide variety of corals, fan worms, and other invertebrates. Most Butterflyfish are known to pick at Aiptaisia, a parasitic anemone.
Readily available in North America. The fish can develop an attitude after being established for a long time. Recommend that it be one of the last butterflyfishes added to the aquarium. Will usually eat a wide variety of pod and meaty-with-vegetable preparations. Forgiving on water quality. As always with most butterflyfishes, it is best to put into quarantine in order to get it eating different foods, and to get it used to humans (as well as to be sure it is disease-free).