What is this?

[jeharrisonjr]

It doesn't seem to have a shell and came with the rock

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[MableShwartz]

What exactly are you talking about?

 

[caudill187]

Chiton?

 

[k2parkstar]

I was going to say chiton as well. Hard to tell from the pic. Its round like a limpet, but a bit to pointy.

 

[gmoney243]

The only thing I see is a limpet. But it has a shell touch it. I have quite a few in my tank all grew up from very very tiny hitchiker babies. Great algae eaters and harmless.

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[velrui]

limpet .....................