Please ID...

[pcolacajun]

I believe this is a sponge, but don't know for sure.

[dudley moray]

cool looking whatever it is , not a coral that ive seen

[pcolacajun]

It has to be some kind of sponge, but I've never seen anything like it.

[Hormigaquatica]

Looks more like an algae to me; maybe one of the calcareous species?

[pcolacajun]

Interesting...didn't think of that...I'll start seaching on calcareous species.

[pcolacajun]

Maybe Galaxaura sp. (G. marginata) ??????

[MarkusII]

Hello,

for me it looks like an algae as well...
eventually: Amphiroa spp. (fragilissima?)

regards

Markus