Nudibranch?

[shaunj]

Hi, I wonder if anyone can tell me if this is a nudibranch or not? and if so, are they good or bad for my tank? It always seems to be around my soft corals that came with the live rock. Thanks

 

[Sniperhank]

Without a picture we can't ID anything for you. But when there are nudibranch going hand in hand with corals, they are usually eating them. You'll know as nudibranch will look very similar to what they are eating.