Non-photosynthetic hard coral id

[Mihai]

I have two non-photosynthetic corals that hitchhiked with a clam and with some rock. I think that they are non-photosynthetic because they have clear tentacles (except for some small white dots). Pic 1 and Pic 3 are the same coral, Pic2 is different (I think).

I'm a bit surprised to see non-photosynthetics bulding skeleton: I thought that they can't (I thought that the simbiotic algae are essential to calcification)...

Any idea what are those?

Thanks,
Mihai

 

[Sugar Magnolia]

looks like phyllangia americana to me. hidden cup coral.

 

[nuku]

Many corals that are mostly feeders make hard parts. Sun corals do...

I think there are some around northern florida that do toculina.

 

[Anonymous]

Could be Balanophyllia possibly...

 

[Mihai]

It looks more like Phyllangia than Balanophyllia.
Balanophyllia has somewhat of a bulging mouth, while mine don't.

M.