Tentacles in my Cabbage Leather

[Mr. Mojo Rising]

Hi, I got this cabbage leather almost 2 months ago, I noticed it was slightly damaged, which I figure was from shipping. The damage has slowly gotten worse, and when I looked closely today I saw tentacles coming out of the leather.

Can someone tell me what it is? And how I can save the coral? Thanks.

 

[Midrats]

Aiptasia.

 

[Udest]

Yep those are definitely bad nems you might want to take care of those before they take your cabbage out.