Any ideas on this one?

[mikebusc]

Started growing from inside a hole in a clam shell. It’s growing bigger.

 

[fishface NJ]

aiptasia

 

[Glenner’sreef]

Looks like a glass anemone. APTASIA!

 

[mikebusc]

Thanks. My first! I’ve been reading a lot of posts about how to get rid of them, but can I just take it out of the tank?

 

[fishface NJ]

If it's in the shell please remove the shell and throw out.

 

[Sophie"s mom]

Started growing from inside a hole in a clam shell. It’s growing bigger.

Definitely aptasia! Get it out!

 

[Daniel Rosenwinkel]

Yeah definitely aptasia I would recommend red sea aptasia-x or nudibranchs

 

[Formulator]

Just be careful not to bang it around too much when you remove it. They can release offspring when they sense a threat. They spread like wildfire and most who get them will always have them. Just one more thing to manage periodically. If you are really lucky and that is the only one, and you can remove the shell its on permanently, you MIGHT not see anymore.

 

[mikebusc]

Yeah definitely aptasia I would recommend red sea aptasia-x or nudibranchs

Crazy coincidence but I placed an order for different CUC’s and one is a nudi! I placed the order two days ago and just found this today.
And yes I took it out. Not waiting for the nudi since it was a very easy eviction.