UTO unidentified tentacle object

[reefpaddler]

My tanks are becoming overrun by these polyp type things. They have long tentacles that seem to sting my corals. Could someone identify these for me and if so are they bad? If they are bad how do I get rid of them? Some are attached to rocks that have corals on them. Thank you

[fragged]

Aiptasia!!!

[Doctor_Reef]

They are bad...look at the threads that talk about aptasia... Peppermint shrimp will sometimes eat it...Inject with kalkwasser, Joes juice, and copper banded butterfly fish will take them out...but check out the threads you do want them out of your tank!!!...