Critter ID

[fernalfer]

What is this? Best pic i could take in focus.

 

[Ron Reefman]

Google nudibranch and see if you can find one that looks like yours.

http://www.bily.com/pnwsc/web-content/Nudibranch Identification.html

I can't ID the specific type it is based on the pic you posted.

 

[Sugar Magnolia]

Aeolid nudibranch. http://reefkeeping.com/issues/2005-05/rs/index.php