Is this good or bad?

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RIVVAAASIDE!!!!
#2
It's just a tubeworm. Like a feather duster except smaller. It's a filter feeder, like a barnicle. Could possibly even be a barnicle. I have a couple in my tank as well.
 

JOSE CASAS

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#5
As the tank matures you will see more and if you want to eradicate them a arrow crab takes care of them.
 
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