What the heck are these things?

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Pisces3473

Aquarium Advice FINatic
Joined
Feb 13, 2013
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In Cali
Anybody know what these things are? Thanks in advance!
 

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Looks like feather duster casings. Miniature type.

I've got a ton of them on the LR my Hammer's attached to. Even on the stock of the Hammer too. Are they bad or harmful? I've got a feather duster growing under my blue mushroom and it looks nothing like these ones. The casing is straight and light brown.
 
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