Aptasia

[Der_Iron_Chef]

If you use copper in a tank with live rock, you'll ruin your live rock! For SURE!

Have you tried introducing anything that will eat the aiptasia? Many have tried peppermint shrimp with success, as well as a copper banded butterfly (although they're not always reef safe for your corals).

You can always get some Joe's Juice or Kalk paste and go to town on them with a syringe....but I'd try a peppermint shrimp (or two) first.

[Reefer Rob]

I used the small pointy syringe that was in an old Salifert KH test kit to inject kalk paste into them. They haven't been back yet. Just don't do too many at once, or you may cause a PH spike.