Found this in my sump

[eferna]

Don't know what it is, but found this on the glass of my sump. Its around 1" in diameter. Anyone ideas?

 

[ReLPSef]

Nudibranch in the middle. Remove it.

 

[eferna]

yeah the whole thing is a nudi damn..it kinda caught me off guard there all flat

here's another pic

 

[eferna]

i think its this
http://www.nudipixel.net/photo/00002357/