Is this a Theropod?

[Pickwun]

I just saw this wormy guy in my tank for the first time yesterday. Note the Asterina to the right for scale. I haven't added anything to the tank in over a year.

 

[Zydan777]

It could be a Bristle Worm

 

[Fishy212]

Bristle worm. Considered a good CUC member . Unless you have an overwhelming amount. They will come out at night and search for uneaten foods and detritus

 

[Wolf89]

Theropods went extinct 65 million years ago

 

[Pickwun]

Theropods went extinct 65 million years ago

Then I guess it's probably not one.

 

[Pickwun]

Bristle worm. Considered a good CUC member . Unless you have an overwhelming amount. They will come out at night and search for uneaten foods and detritus

I guess that's why he's so tiny. The only food in the tank would be asterinas and the tiny ant-like crustaceans that are running all over the glass.