Zooanthids, possible Zoapox

S

sunfun

As the title says, both of my zooanthid colonies are not opening up. (Haven't been for a while) I gave them a fresh water dip tonight and didn't find any predators. (Lots of small snails, bout the size of a ball point pen tip, maybe a little smaller) But found this on closer inspection.

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I'm thinking Zoapox. Can anyone with more experience confirm or deny?

I'm hesitant to dip my second colony because it has 2 large sponges of differing colors growing on it and I'd rather not kill them if I don't have to.
 
I have the same thing growing all over my tank, especially along the walls on my tank. I scraped some off and looked at them under a microscope and found that there was nothing at all living inside of most of them. They looked to me like just a really really small type of feather duster or some type of tube worm. They aren't causing any harm in my tank and i've had them since start a year ago. Mine are really small like yours. Don't worry!
 
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