What is this thing?

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rm86100

Aquarium Advice Apprentice
Joined
Aug 19, 2009
Messages
22
Location
NC
I have these things growing on my LR. these things hide when make a sudden movement near them or change in lighting.

You can barely see them in the pic. They are like little white tree looking things.

As always thanks for your help.
sf9xjc.jpg
 
so these are not harmful? what is their function?
 
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