Black snail hitchhiker

Looks like conch snout, maybe trocus snail, it's definitely cleaning your algae and may need supplements. shells can discolour, change due to environment lighting, algae growth (on shells) etc so can make it hard for positive identification.
nothing to worry about in my opinion, it's just eating away :)
 

WHAT PART OF LIVING WITH A REEF TOOK YOU BY SURPRISE?

  • How much space the supplies and equipment take up

    Votes: 10 43.5%
  • Salt creep, spills, and cleanup outside the tank

    Votes: 3 13.0%
  • Planning trips or finding someone to care for the reef

    Votes: 7 30.4%
  • How attached I’d get to individual animals

    Votes: 2 8.7%
  • Making decisions when there’s no clear right answer

    Votes: 4 17.4%
  • How much the reef affects everyday household life

    Votes: 6 26.1%
  • Nothing in particular, I felt well prepared

    Votes: 1 4.3%
  • Other (Post in the comments)

    Votes: 1 4.3%
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