ID please

[jaws789832]

Don't think its Aptaisia but it could be. Its real dark with white stripes on its tentacles.

I have about 3 of them that I can see but this one is really the only 1 I can get an OK shot of

 

[Lionfish Lair]

It's an appy.

 

[Salty1962]

Get rid of it ASAP! Not good.

 

[alvarezhector953]

What is it and what does it do?

 

[Sean Shimer]

It is definitely Aptaisia