Care
The Pyramid Butterflyfish is known from steep, current-swept outer reef slopes to depths of 60m (197ft). This species is often observed congregating in sizeable shoals that may extend several metres above the reef, as the fish feed on the abundance of zooplankton that the currents deliver. Hemitaurichthys is an often overlooked genus, containing 4 known species. It is a shame that they are not seen more often in the trade, as these are relatively hardy fish that acclimatise well to aquarium life, and if well fed, they usually pose no problems in reef aquaria that house some of the more noxious soft corals. A number of aquarists have even found them to be completely reef-safe, but as with such matters, "your mileage may vary", and we would recommend exercising caution and careful observation. Pyramid Butterflyfish grow reasonably large and are an active species, so a spacious aquarium that allows room for both ample live rock and a decent swimming space along the front of the tank is requisite. Ideally this peaceful species will be maintained in small groups, as it prefers to live in aggregations - intraspecific aggression should not be an issue here. It is best to try and obtain medium sized specimens of between 7.5 and 12.5cm in length, as these always adapt to aquarium life much more readily than those which are very small or very large. If planning on adding a group (and this is best for their long term wellbeing), try to obtain specimens that are all of roughly equal size, and add all to the tank simultaneously. They should be the only butterflyfish species in the aquarium, and if at all possible, tankmates should be of similar size and temperament. Any fish which could be considered as mildly aggressive should be added after the Pyramid Butterflyfish have established their territories, and only if the tank offers sufficient space and ample visual barriers amongst the rockwork. Never try to house these fish with boisterous feeders as they are likely to intimidate the butterflies at feeding time. Ensure that the water is thoroughly filtered and well oxygenated, and provide areas of brisk current. As with all butterflyfishes, they are always going to be much less likely to pick on corals and other invertebrates if they are well fed and given plenty of space and distractions. May also be seen on sale as Yellow Pyramid Butterflyfish. The intensity of the brown-black area on the head can vary depending on mood, time of day etc. It is replaced by the black/brown and white Zoster Butterflyfish (H. zoster) in the Indian Ocean.
Feeding
Offer a variety of tiny and small frozen foods, in small amounts several times per day e.g. plankton, baby brineshrimp (Artemia nauplii), vitamin-enriched brineshrimp, Mysis shrimp, Angel & Butterfly Mix, and finely chopped krill. A refugium beneath the tank is always handy to culture an ongoing supply of copepods and the like.
Breeding
This species has not been bred in captivity. In the wild, these fish form distinct pairs and scatter their eggs in open water.
