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Black/Oblong Rock-boring Urchin - Echinometra oblonga; it could also be the Burrowing Urchin, E. mathaei, as the two are similar enough that E. oblonga was once considered a morph of E. mathaei,* but - based on the coloration of your specimen - E. oblonga seems more likely to me.
Either way, both species primarily reside in the rocks and primarily feed on turf algae of various kinds** - so a good herbivore for your tank.
*Source:
**Source:Echinometra oblonga - Plazi TreatmentBank
treatment.plazi.org