What is this plant?

[Tkhaggerty]

What is this plant? I assume its a type of algae but can find it online anywhere. Any info will help

 

[Ted]

I am think Halimeda but not sure....think the pic is on its side. I did notice some aiptasia tentacles. If you turn you head to the left and look at it sideways would be on the right of the picture near the bottom of the algae

 

[Tkhaggerty]

Thanks yeah I took the pic before I eliminated the aiptasia

 

[Bifferwine]

That looks like caterpillar weed to me. I'm not sure though, the pic is a bit blurry. Can you get a more clear shot?