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Old 08-04-2014, 05:54 AM   #1
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ID please - anemone like creature that only comes out at night

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Can someone please help me to identify this creature? It only comes out at night, always in the same spot, and sometimes when I shine a light at it it retracts into the rock. It looks like aptasia but I didn't know they could retract like that.
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Old 08-04-2014, 12:10 PM   #2
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I have the same thing. Only out when lights are off. No one could positively ID. Aiptasia is only response I got.

From my searches online the closest I could get is stripped bead anemone. And there is little info on those. Certainly doesn't behave like any aiptasia I'm aware of.

I'm sure others have these on their tanks but just don't know about them as they only come out when lights go off and they kind of blend in which makes them difficult to spot.

I am tempted to kill it just in case. But for the time being it is in the sump.
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Old 08-04-2014, 12:17 PM   #3
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Thanks, Dav3. Could it be a feather duster of some sort? The more I look at it, the less it seems like an anemone because of the way the "feathers" flare out, the lack of a visible oral disk, and how quickly it retracts completely into the tiny hole in the rock.
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Old 08-04-2014, 12:30 PM   #4
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Looks to be some sort of glass anemone, I personally would get rid of it but that's up to you.
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Old 08-04-2014, 12:59 PM   #5
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ID please - anemone like creature that only comes out at night

Certainly not a feather duster.

And I could find no reference to any nocturnal glass anemones.

This is a close up of mine. There is an oral disc just tucked back a bit.
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Old 08-04-2014, 01:25 PM   #6
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Thanks again Dav3. I looked up striped bead anemone and it does look like one. Anyone know if they are harmful?

I'm going to leave it for now and continue to monitor the situation, particularly because it's going to be difficult to catch since it only comes out when lights are off and is at the bottom of the tank. If it starts moving I might have to eradicate it.
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Old 08-04-2014, 01:59 PM   #7
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It's funny. Well not really.

But I search the web and find plenty of posts about nocturnal anemone that looks or are described just like ours but not a single positive ID.

Any marine biologists out there?
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Old 08-04-2014, 03:42 PM   #8
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Could it be a majano?
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Old 08-04-2014, 03:48 PM   #9
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Doesn't appear to be that. More closely resembles aiptasia but it is nocturnal. Which is not a trait of aiptasia as far as I'm aware.
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Old 08-04-2014, 04:42 PM   #10
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Any tips for removal without having to take the rock out of the water? It retracts incredibly fast and completely disappears into its crevice.
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