Its a non-photosynthetic coral, which means "leave it in the ocean". The vast majority of these slowly starve to death in aquariums since feeding them properly will usually result in polluting your tank. A specially non-photosynthetic system can be set up with large refugiums and including sources of coral food (maybe the bacteria from biobeads or other special "filters"). Otherwise, in a mixed reef, your other corals will suffer from the overfeeding necessary to try to keep one of these non-photosynthetics alive and a lot of times, even that is not enough.
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If you see it, can take care of it, better get it or put it on hold. Otherwise, it'll be gone & you'll regret it!
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