Can anyone tell me what this is thanks

[Purrrfectlee]

Hi I have just noticed this clear tube it wasn't there yesterday bought a large feather duster a few days ago it came attached to a piece of live rock and this morning I noticed this tube it seems to be coming from the feather duster and has attached itself to another piece of live rock hope someone can help many thanks


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[Macscale]

Seems to be some kind of sponge, but it's hard to tell.

 

[Purrrfectlee]

Thanks


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