Filefish
Less often kept than their relatives the Triggerfish and Puffers there are many filefish that make good aquarium residents, and a few that require specialized diets making it hard to sustain them in an aquarium.
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The blacksaddle filefish, Paraluteres prionurus, is a filefish of the family Monacanthidae. It reaches a length of a maximum 11 cm.
The blacksaddle filefish are found in pairs or in small schools and inhabit reefs across the Indian and Pacific oceans.
Coloration is sandy to grey with distinctive black "saddles" on the back and a yellow tail.
The blacksaddle filefish has evolved to mimic Canthigaster valentini, a highly poisonous pufferfish commonly found where ever P. prionurus is found. The two species have been known to school together.
The orange spotted filefish or harlequin filefish, Oxymonacanthus longirostris, is a filefish in the family Monacanthidae found on coral reefs in the Indo-Pacific Oceans.
The orange spotted filefish is pale blue with about eight longitudinal rows of orange-yellow patches. In the wild it almost only eats Acropora polyps.
It is often offered for sale in the aquarium trade, but few specimens survive long in captivity. It is difficult to maintain in an aquarium unless it is provided with live corals. The fish must be kept in a species-specific tank, or a tank with very passive tankmates such as seahorses or pipefish.