can you say bonus yup sea cuc. apparently they eat alot here are a couple of links.

http://www.advancedaquarist.com/issu...003/invert.htm
http://www.saltwater-aquarium-guide....thumbnails.htm

It a sand sifting cuc here a link to look at. they look the same.
http://www.saltwater-aquarium-guide....a-Cucumber.htm
Bill