Cucumber?

[jasonbucholtz]

I think this is a sea cucumber on my glass. Can anyone id it?

 

[Tangnerd]

It looks like a cucumber to me so nice find.

 

[Calappidae]

Yes, cucumber.

I've seen a couple of these exact ones crawling on the glass at the lfs. By chance what rock are you using?

 

[radiata]

Not sure of the correctness of my observation, but I think cucumbers either ingest sand and/or detritus OR are filter feeders. Most of the small yellow cucs I see for sale stuck on the sides of retailers tanks, are indeed filter feeders. As those in your photos are climbing on tank walls, I'm inclined to ID them as filter feeders. I find the sand/detritus feeders can survive in a simple reef system, but that the filter feeding cucs stand a snowballs-chance-in-hell if not feed food that will enable them to filter feed successfully...