Help with IDing growth on live rock

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ants86

Aquarium Advice Regular
Joined
May 7, 2013
Messages
78
Location
New Brunswick, NJ
There are small white semi-transparent branches growing on my live rock in various places. They don't move or anything but sometimes food will get trapped when it floats by. My tank is about 3 months old. Water parameters are fine but I also have some cyano on the sand bed.

Two pics are attached. Any help would be much appreciated!
 

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