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The Rainfordi Butterfly, Chaetodon rainfordi, also known as the Rainford's Coralfish and Northern Butterflyfish. This Butterflyfish has a bright yellow with a dark orange bar running though the eye followed by white bars, a curved orange band on the body, and another on the tail fin. On the sides are two broad bluish gray bands with yellowish orange along the edges, making it a gem of a species for any tank. They can grow to be 6 inches, and should be kept in a tank no less than 60gallons if kept individually, and no less than 100 gallons if kept in a pair. If keeping a pair, it is best to add them to the tank at the same time. They can also be kept in small groups in a larger system. The tank should also be well decorated with plenty of live rock creating caves and crevices. The tank should also have plenty of natural algae for the Butterflyfish to graze on between meals. They also require plenty of open space for swimming about. To acclimate and sustain this Butterflyfish will take great dedication and devotion. It is better at acclimating when kept in a small group, or with other hardy Butterflyfish that may entice it into trying substitute foods. Overall this fish is notorious for being a poor eater and not overly hardy. It is one of the most difficult Butterflyfish to keep in captivity, and is best reserved for only the expert aquarist. The Rainfordi Butterfly is not considered reef safe, as it eats live Polyps of Stony and Soft Corals, and small Benthic Invertebrates, but can be kept with the exception of the more toxic Soft Corals. Their diet should consist of omnivore offerings, such as live Brine and Mysis shrimp, finely chopped Clam and Crab, Japanese Nori, Spirulina, the tank should also have lush filamentous algae for it to graze upon, and keeping it with a few other hardy Butterflyfish to help enticed it to accept substitute foods will not hurt either. If you are having difficulty get them to eat, you can try to Clams with their shells cracked open, or stuffing meaty foods into a Coral skeleton, to mimic their natural eating habits. Feed 2 times daily to ensure their overall health. They will thrive at a temperature range of 75-81°F and a pH of 8.1-8.4.