Hitchhicker with long tentical ane

[Ldas09]

Have like 40 of these pop up from nowhere recently only additions were bubble and long tenticals. Any help would be appreciated if they are safe.

Best regards

 

[bribo12]

Looks like aiptasia. Definitely not good

 

[Sniperhank]

That is a lot of aiptasia. Take that rock out asap before they spread.

 

[54seaweed]

if its all on the one rock I would remove that whole rock , a lot easier than dealing with it in your tank ,

 

[Reefing Madness]

Remove rock, muriatic acid wash the rock. Rinse and put it back in tank.