ID please

[OUBrook]

Sorry, I can't get any photos of it right now since the camera is in Enid, but I have something on my gorgonian. Where the branches V, there is something living in the middle of it. The gorgonian died when a rock fell and blocked it's light, but this thing in the middle is still alive. It's somewhat like a slug, but upright like a sea squirt/tunicate. It's grayish and pretty ugly. When you shut the cabinet doors, it retracts from the tap. It has never moved from that place before, so I ruled out sea slug or nudi. It doesn't appear to have a point of cephalization. I can't tell if it's one creature or a colony of maybe 2 or 3. It seems to be just one. Can a tunicate retract to siphon? I can't find anything that looks like it. I guess a sea squirt would be the closest. Any ideas?

 

[OUBrook]

Well, after posting I decided to go move the gorg it was on closer to the glass so I could get a good look of it. When it's open and happy, it does resemble a tunicate more. Even though it's ugly, it's okay to keep it in my tank, right? Does anyone know anything about these?

 

[Travis L. Stevens]

Most likely it's a type of tunicate. It's a filter feeder that rarely does well in captivity. Phytoplankton additions will definitely help out.

 

[Russ Braaten]

Brook, You are not allowed to ask for help and use words like "point of cephalization" at the same time.

 

[OUBrook]

Well, this tunicate does well in captivity, lol. I've never tried to keep it alive! In fact, it scared the poo out of me the first time I saw it move when I almost touched it. So it could have died and I would have felt safer