ID please

[Authentic]

saw this little something on my coral in the AM after everything was asleep.any idea what it may be?and if its bad how to get rid of it?

[seapug]

very hard to tell from the blurry photo. Could be a sponge, could be a Pseudocorynactis, could be a nudibranch, but if the polyps located around it don't seem to be affected during the day when they are open, it's best to leave it be.

[Zappo]

If you touch it, does it move? It looks like a sponge, but touching it will tell you for sure.