what are these white tubes

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sansouci01

Aquarium Advice FINatic
Joined
Jul 6, 2012
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Location
Orlando Florida
Just noticed a lot of these on my live rock. Looks like small groups of them. Picture is not that great but I think you can see them
 

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Kinda looks like sponges. They sometimes appear in shaded areas, more so towards the bottom. Harmless filter feeders.
 
Kinda looks like sponges. They sometimes appear in shaded areas, more so towards the bottom. Harmless filter feeders.


Yep, sponges. There are many types and none in aquariums are bad.
 
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