Unidentified nudibranch

This guy game in as a hitchhiker on some Bali live rock. Any one know what species it is? And if it is safe in a reef tank?

I noticed it a few weeks ago and I see it every few days. It is only active during the day. At night, it curls up into a ball and hides in the rock.

 

I dont know what type of nudi that is, but it does not look reef safe.

 

might be Thuridilla gracilis. Don't know anything about them but looks very similar as far as structure.

looking at this site
Thuridilla gracilis (Risbec, 1928) - Plakobranchidae » Nudi Pixel

 

does it have any structure on the topside that we can't see?

 

That would be it I think! Thank you.

The top side is folded, just like it is in the picture you linked.

 

I've found a link that says it eats algae, as I suspected since it spends a lot of time on rocks and the coral in the tank seems healthy (except for my fox coral for some reason).

Thuridilla gracilis | Cataloging Diversity in the Sacoglossa

 

what a cool find!!

 

Yup, it's a Thuridilla species for sure, and probably is Thuridilla gracilis. It ONLY eats algae, so it shouldn't be a problem for anything in your tank. One more link:

The Sea Slug Forum - Thuridilla gracilis

Cheers,



Don

 

cool. I searched for all kinds of variations and that is the closest I could find. You should think about submitting it to the link as they also have nudi experts on there and could confirm 100% most likely. Would hate to be wrong and have some of your coral munched.

 

You have all the reason in the world to put some confidence on Pagojoe's ID.