Cotton balls or snow like things

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pyly220

Aquarium Advice Apprentice
Joined
Feb 4, 2012
Messages
34
Location
CT
This is a new set up. Is a 50 gal tank , live sand some live rocks and dead rocks no livestock. It has being running for 3 weeks. This snow like or cotton balls has like a little tube coming out from them. Does anyone know what this may be? Thanks!!!
 

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Are they safe or should I worry about any toxin release from them if stress???
 
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