What is that creature in my rock

[mrsc]

There is a creature with long tentacles in one of my aquarium rocks behind the zenia

 

[Reefer Dan]

There is a creature with long tentacles in one of my aquarium rocks behind the zenia

The video is not working but based on your description, is it a brittle starfish?

 

[EeyoreIsMySpiritAnimal]

There is a creature with long tentacles in one of my aquarium rocks behind the zenia

That looks like it might be aiptasia

 

[Biokabe]

Aiptasia, 100%.

 

[Provate]

There is a creature with long tentacles in one of my aquarium rocks behind the zenia

Aiptasia

 

[mrsc]

Aiptasia

How can I safely get rid of this thing

 

[EeyoreIsMySpiritAnimal]

How can I safely get rid of this thing

There are all kinds of threads on this topic. Here is one: https://www.reef2reef.com/threads/aiptasia-as-a-pest-and-how-to-get-rid-of-it.770001/

 

[Spare time]

How can I safely get rid of this thing

Gel superglue