Burgundy puffy thing

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FishFreak1961

Aquarium Advice Freak
Joined
Dec 31, 2009
Messages
218
Location
Goldsboro, NC
What in the world is this burgundy puff
on my rock down at the bottom mid way.
It is growing some every day.:confused:
 

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It looks almost like a sponge of some type. Does it release air bubbles through out the day? If it does then it is not a sponge, most likely algae.
 
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