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Need help

I am basicly reduing my tank and as i look on the rocks i see white sponge like things on a bunch of rocks, is that ok? also on 2 rocks i see 2 small white things they look like tiny white feather dusters with red hair that comes out and retracts just like a feather duster what is that?
 

Phyl

Officer Emeritus
Officer Emeritus
Sponge is good. As are the feather dusters. No worries on either of those.
 
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