what is this??

[damac20]

what is that black thing at the base of my sps...it looks like a snail with no shell.

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[LeslieH]

Stomatella snail. The shell is elongate & flattened like an abalone shell. It's small compared to the size of the body so it doesn't look like a typical snail.

 

[Paintbug]

they are harmless algae grazers as well.

 

[sulp]

Stomatella is correct. Totally harmless and benificial.