Whats this thing ?

[AllenJames]

Is it a pest ?

 

[Anonymous]

What are we looking at, the yellow critter?
If so without a better picture it appears to be a species of Colochirus (cucumber) harmless detritivore.

mario

 

[SnowManSnow]

I think that's a berghia (spelling) nudibranch. If so they eait aipstias. If it isn't a berghia I think its definitly a nudibranch. Keep an eye on it to see if you see him on your corals. It may be worth pullin it out to get a better pic for a positive ID.

B

 

[SnowManSnow]

here's a link.... see if it looks like these guys.

B

http://www.saltyunderground.com/images/twoBerghia.jpg