Please help to ID

[vinccc2009]

[iskay]

Too blurry to make out anything. My guess is some bivalve is it it stationary. If it moves it could be a stomatopod.

[vinccc2009]

Yes. It's moving when shrimp walk pass it.

If it's really as you say, it's a pest ...mantis will kill small fishes.

[iskay]

Post a clear pic.

[vinccc2009]

That's best I can take.

[Lee Khim Ann]

most likely mantis shrimp. i have a tiny one which hitchhiked into my tank. u can try poking a toothpick into its burrow and if u feel "punching" its definitely mantis

[Whiskie]

Looks like clams. My rocks have a number of them.

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[Kelvin Ang]

Should be small clam

[Kingking]

If it is Mantis, at night you might get to hear TICK TICK sound, like he is attacking something.

And you might experience some losses in fishes as he will attack them.

Better to get rid of it ASAP.

[vinccc2009]

Problem is...the top of this rock are my sps...

How to dig it out without shifting the rock?

[Lee Khim Ann]

Try removing it using tweezers?