Is this Aiptasia? New tank

[MAH]

It's pretty small, obviously sitting on the back of an empty hermit shell.

 

[TheBear78]

Could well be. No point taking chances just take it out.

 

[MoshJosh]

Yeah looks like it. I would remove the shell, but keep in mind it may be elsewhere too!

 

[Cincyreefer513]

Yes, it appears to be. As mentioned before, remove the shell, but do so carefully as to not disturb it and stress it out otherwise you might get a lot more.

 

[MAH]

Ok, I removed it.