ID please

[Delphinus]

Have to agree. I took the route that "they're probably harmless" and let them be, now every single rock in my tank is almost completely covered. A great way to devalue the live rock.

Black limpets eh? Hmmm. May have to try some. Right now I have two CC stars that I'm letting them go to town on this rock although they don't seem to be touching them. However with the infestation as bad as I let it get in my tank it could take months.

There is some talk about Panacur to treat a tank of hydroids however it is quite unpleasant (it will kill a great deal of other things, including shrimp, worms, and who knows what else) so I would think it is only as a matter of desperate last resort. I looked into doing the Panacur treatment but have elected to hold off on that for now, giving the CC stars a shot.