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Angelfish   Pomacanthidae

The Angelfish family, (Pomacanthidae), although closely related to the Butterfly Fishes, are clearly distinguished by one specific characteristic, a spine on the gill covers. This accounts for the Family name which is derived from the Latin, Pom = "cover", acanthus= "spine".  The Family is subdivided into 9 genera although not all feature in the aquarium trade.
Off the 9 groups, Apolemichthyes, Centropyge, Chaetodontoplus, Euxiphipops, Genicanthus, Hobocanthus, Pomocanthus, Pygoplites and Sumireyakko, perhaps Centropyge, (Dwarf Angels) is the best known, it is certainly the most common amongst aquarists.
Angelfish are true reef fish, spending all their time in and around the reef, rarely, if ever, venturing out into open water.  The dwarf species in particular are never far from a bolthole in the rubble and crevices of the Coral, although larger species such at the Emperor or Queen Angels are often seen "Cruising" and will even take up defensive postures when approached by over inquisitive divers.
As aquarists one off our prime considerations is size, or lack off, and so I have divided this family into two sections. This section covers all the larger genera, but as many as totally unsuitable for the home aquarium, it is not overcrowded. A second section is devoted solely to the Centropyge group (Dwarf Angels) as these are generally considered as the most suitable for home aquaria.
Angelfish display a great diversity in not only their feeding habits, but also in their behaviour.  Many of the larger species exhibit distinct differences between juvenile and adult pattern and colouration such as the Emperor Angel.  In the wild, adults will happily tolerate numerous juveniles living within their territory, but once their adult colouration begins to appear they are driven off to find their own spot on the Reef. Clearly this is not possibly in the average aquarium so as a general rule only one of any genera per tank.
In the wild Angels, like their cousins the Butterflies, are grazers and will roam the reef eating a wide variety of food, everything from algae to most of the "Greens". They will also unfortunately browse on some of the Coral polyps.  While this may not be much of an issue on a reef stretching  for hundreds of metres, it can prove devastating in a 1 - 2 metre tank.  For this reason they are generally considered as unsafe in a reef aquarium.

Grosvenor Tropicals
 Angelfish Pomacanthidae
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