Attached to live rock??

[BlueKoran91]

This came attached to my LR and I was wondering what it was....any ideas??

[FireWater]

Looks like a toadstool. Not bad, but can grow in a hurry and can also release toxins other coral don't like if it is messed with.

[FireWater]

http://www.liveaquaria.com/product/prod_display.cfm?c=597+600+753&pcatid=753