Unknown critter, help ID it please

[tomdeb]

This just appears on the glass of my tank. Can you help ID it please ?

 

[Saltyreef]

Nudibranch.

 

[tomdeb]

oh ok. thanks very much for the quick reply.

I new to this. Should I leave it be or remove it from the tank?

 

[Mr_Knightley]

the bright colors make me think it's a zoanthid eating nudibranch, so it would probably be best to remove it.

 

[tomdeb]

thanks a lot for the unbelivably quick replies. It's out.

 

[LegalReefer]

Where there’s one, there may be more. Keep an eye on your corals, watch for other similar organisms, and look for die-off or unexpected disappearance. Good luck!