Are we talking about Genicanthus melanospilos or Genicanthus semifasciatus? Both of those sometime are being referred to as Japanese swallowtail. G. melanospilos is a little easy to adapt to aquarium life, G.semifasciatus harder because of where they are collected. But both will accept prepared food after adapting to aquarium. Both are friendly to other fish except to their own species. Genicanthus is usually reef safe.
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