OMG WHAT IS THIS NUDIBRANCH ?!

[Kurtis1]

 

[redfishbluefish]

There are thousands of nudibranch and getting an actual genius and species might be difficult. I'm no expert, but searching "nudibranch white branching cerata", this Tritoniopsis elegans popped up that has similarities to yours. If anyone would know, it's going to be @KJ

 

[WV Reefer]

oooh, it’s pretty!

 

[vetteguy53081]

alamy
Onchidoris macropompa nudibranch and not reef safe
Sump it if able to

 

[Tired]

Ooh, very pretty.

Many nudibranchs look like their food. Assuming you have corals that this little guy would camouflage well on, you should sump it.

 

[KJ]

Mariona sp.