Some kind of limpet? (pic)

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I'll answer my own question. Upon removing for closer examination, they have holes in the top. Keyhole Limpet. I removed all 4 that I could see. The lights had just gone off so they were all running out into the darkness.
 
I have tons of them and they all have the keyhole in top. They are great algae grazers and I've even seen mine take out spots of cyano.
 
I have corals and I've never seen them go near one. I've read conflicting information on keyholes. Better you be safe than sorry. Just giving you my experience.
 
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