Help with ID on Black swirl

[604reefer]

Thanks!

I sniped 4 of these with a razor blade and hacked the base away. 3 off my frogspawn and one off a hammer. Hopefully the frogspawn perks up again...

Still got 2 on the mushroom rock, but that's where my jumper hides and I think he needs some space lol.

[smokinreefer]

Yeah if you can get rid of them I would.

Even in "plague" porportions I find them to be more of an eyesore than anything.

Though they can irrate some corals when they send out their sweepers.

They don't really have any benefits of being in the tank.