Nem ID

jabberwock · Nov 9, 2022

Gulf of Mexico hitchhiker. Does not look like aptasia (I think...)

jabberwock · Nov 9, 2022

Who thinks it is aptasia?

sfin52 · Nov 9, 2022

If it's from the gulf it's not aptasia

jabberwock · Nov 9, 2022

sfin52 said:
If it's from the gulf it's not aptasia

Nice! I will monitor and post updates then.

jabberwock · Nov 9, 2022

...but what is it?

F i s h y · Nov 9, 2022

Ball nem

WheatToast · Nov 10, 2022

sfin52 said:
If it's from the gulf it's not aptasia

Exaiptasia pallida, once known as Aiptasia pallida, is found in the western Atlantic from Maine to the Caribbean and is sometimes said to be the quintessential pest Aiptasia species in aquaria. That being said, OP's polyp looks much more like those of the hitchhiker coral Cladocora arbuscula:
https://www.nano-reef.com/gallery/image/455-cladocora-closeup/

WheatToast · Nov 10, 2022

@LiverockRocks

jabberwock · Nov 10, 2022

LiveRocks said cup coral, but I do not see any skeletal structure. I am thinking Ball Nem.

WheatToast · Nov 10, 2022

jabberwock said:
LiveRocks said cup coral, but I do not see any skeletal structure. I am thinking Ball Nem.

Ball anemones (Pseudocorynactis caribbeorum) have transparent tentacles with opaque tips while the hitchhiker has glittery tentacles. Perhaps it hasn't grown much of a skeleton yet.