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It will depend on the purpose; I always intend to get their flashing display so I will obtain males as many as possible if I can. Flasher males tend to display well when other males are kept at the same time (no need to have P. cyaneus females). It will be OK when other species of Paracheilinus are maintained in the same tank. But I will reintroduce them when I bought a new fish. So I always have a simply decorated tank with white sands, (live) rocks and dead corals that should be white.
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