Should I keep this critter?

[djmicl]

I spotted this guy the other day but not sure if I should keep him?

Will he damage any corals?


http://s273.photobucket.com/albums/jj229/djmicl/

 

[gasman059]

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[gasman059]

looks like a lettuce nudibranch- been wrong before many times.

 

[ReefWreak]

Maybe a nudibranch.... but who knows if its good or bad for the tank.... Where did you find it? That might be it's food source.

 

[WLDSHARK]

My .02 It looks like an Elysia ornata sea slug....RS

Elysia ornata (Swainson 1840), known to science as the Ornate Sap-Sucking Slug. This genus is often sold to aid in the control of marine aquarium algae overgrowth, particularly Bryopsis. Much easier to control such outbreaks by limiting nutrients, providing competitors for light, food, using more generalized herbivores. To about an inch and a half in length.

http://www.wetwebmedia.com/seaslugsopisthobranchs.htm

http://www.seaslugforum.net/factsheet.cfm?base=elysorna

http://www.nudipixel.net/species/elysia_ornata/