Yellow thingy?

[Foxchase]

Was looking at the tank in the middle of the night and i saw this thing. Can anyone ID it for me and tell me if it's safe. If not, how can I get rid of it?

(Sorry about the pics. It was the best i could do)

 

[sp1187]

nudi (nudibranch) of some sort.
no idea if it's safe or not.
if removing suck it out with a turkey baster.