Please help identify

[Freakmachine01]

I'm trying to upload video but it won't let me. I am doing some landscape Remodeling and I found this in my tank. It looks to be some type of nutty Branch can somebody please identify thank you

 

[sunken3]

ha.. i thought it looked a little like an octopus...

 

[Freakmachine01]

Yes it did sort of look like that but it's 100% flat it went into all the rock crevices

 

[Reefkeepers Archive]

I feel like I've seen this before, @ISpeakForTheSeas?

 

[ISpeakForTheSeas]

I'm trying to upload video but it won't let me. I am doing some landscape Remodeling and I found this in my tank. It looks to be some type of nutty Branch can somebody please identify thank you

How big is this, and have you added anything that it could have come in on (such as live rock) recently?

 

[Freakmachine01]

How big is this, and have you added anything that it could have come in on (such as live rock) recently?

I have not added any new rock in at least a year and a half. I went to do some landscaping and pulled a huge flat piece off the bottom of my tank and it was underneath it

 

[i cant think]

I'm trying to upload video but it won't let me. I am doing some landscape Remodeling and I found this in my tank. It looks to be some type of nutty Branch can somebody please identify thank you

I feel like a polyclad flatworm is an option for what this is.

 

[Reefing102]

Did you start with live rock from the ocean? While I originally though octopus, my guess would be a type of polyclad flatworm (such as Phrikoceros mopsus)

 

[Freakmachine01]

How big is this, and have you added anything that it could have come in on (such as live rock) recently?

It is about 2inches by 3.5 inches fully spead out.

 

[Freakmachine01]

No Rock from the ocean. Tank has been up and running for 3 years now.

 

[Freakmachine01]

From the size it had to be there for a while. I dip all new additions.

 

[Idech]

Upload your videos to YouTube so we can see them.

 

[Freakmachine01]

 

[Freakmachine01]

After doing research it does look like a polyclad worm

 

[ISpeakForTheSeas]

Can you get a straight-on, top-down shot of the critter?

I'm familiar with a number of different nudibranchs, sacoglossans, and flatworms; some of them (such as a few Pseudocerotid flatworms) look relatively similar to this, but none of them have that that odd, corkscrew appendage you can see is somewhat separate from the body on the left in the video. Honestly, that appendage has me wondering if you've got an octopus or cuttlefish mimicking a flatworm. (Octopuses can fit through/into any holes that they can fit their beaks into, so it likely could squeeze between the rocks in the tank as, but this would be rather odd behavior for an octopus).