Bad or Good?

Joined
Nov 18, 2012
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#1
I have these brownish polyps growing from my live rock. They are coming out of a tube formation. Are these bad or good for the tank? unknown.jpg

Not the zoas either.. you can see some brown little polyp looking things.
 
Joined
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#2
Those look like feather dusters, which are good. They're filter feeders.


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Joined
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#3
If you mean the middle right of the pic those look like aiptasia to me. What polyps are you talking about?
 
Joined
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#7
The first pic is hydroids. Not normally a welcome inhabitant for our tanks. They're fine but they can bother coral that's too close.

I can't tell what's in the second pic. Majanos maybe?
 

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