Does it have loosely space tiny hair like polyps? If it is a coral, the shape suggest it could be a fire coral, a member of the genus Millepora. Not to be confused with Acroprora millepora. in the genus Acropora. I will see if I can find a pic of ours, which is a brown colour, yours looks bleached.
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> this entomologist loves being bugged <
Current Tank Info: 142 gal mixed reef
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