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 :)
 

IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

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