What is this?

Tszat

New member
Can anyone tell me what this is?
We made more room in our fuge by removing some sand. We found this about three inches down in the sand stuck on the side wall. It is HARD to the touch and has NO soft spots. Since we removed about 3" of sand, it was in the water when we filled back up again. Within 2 minutes, it had moved it's way back beneath the sand.

Thanks.
 

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