What is this?

[alyak06]

Any idea what this is? It looks almost like a shell that disintegrating, but do shells do that? We only have the clean up crew in this tank, but we did just add a new rock on Saturday. Could this have been some sort of hitchhiker from the rock? Should we be concerned? Assuming our water tests go well tomorrow we hope to move our clownfish to this tank.

 

[Reefing Madness]

Might have been something in the Rock. Pull it out take a peak at it.