Fungus maybe?

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Blakers

Aquarium Advice Apprentice
Joined
Oct 17, 2011
Messages
39
Woke up this morning and found this on my rock, Idk what it is so I'm seeing if anyone out here know if it's something bad or not
 
Some type of sponge. I have them in my tank also. They are good filter feeders.
 
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