Help Pest or good guy?

[Usarmy227]

Anyone have an idea of what this is? I’m assuming a pest snail? It was on a coral that I was about to dip. If it’s good guy I’ll put it back. It was only one and it’s like greenish/transparentish and 2 antennas.

 

[Savage Henry]

Looks like a nudibranch. Remove and quarantine.

 

[Tinnerito]

Anyone have an idea of what this is? I’m assuming a pest snail? It was on a coral that I was about to dip. If it’s good guy I’ll put it back. It was only one and it’s like greenish/transparentish and 2 antennas.

Very interesting... It looks like some kind of nudibranch to me. I don't know if it is of any harm, but me personally I am keeping it around to see what happens. Just don't take my word for it :)

 

[Savage Henry]

Look up Michael’s book. I vaguely remember a green slug thing that was considered beneficial. Otherwise, squash that dang thing!

 

[Fish Styx]

+1 nudi. Remove

 

[Crabs McJones]

Elysia Sp/Caulerpa Slug

 

[Usarmy227]

Elysia Sp/Caulerpa Slug

Thank you!! Looks like you are right! So not a bad guy but not one you truly want to have lol.

 

[BonnieB]

Elysia Sp/Caulerpa Slug

+1

 

[BryanM]

If slug, yeah, beneficial with risks. Those risks are not worth it in my slice of the ocean.

 

[Savage Henry]

I had in my mind a Berthelinia species. It’s in Shimek’s book, not Michael’s book. They actually have a shell, so not your beastie.

 

[elissasoroj]

It is indeed a sap-sucking sea slug, belonging to the genus Elysia. If you or anyone else ever comes across another one we would love to have you send it to us instead of squashing it - I'm a researcher at Harvard. We'll pay to overnight it to the lab and happy to acknowledge you in anything that we use it for :)