Maybe coral?

[KittenChiu]

Not sure what this is but I'm guessing some kind of coral. If not, please let me know and I will ask in the hitchhiker/critter forum. Growing on the rock that is the base for a black sun coral.

 

[BranchingHammer]

Kinda looks like a leptoseris?

 

[bobby.w.hodges]

Looks like leptosaris

 

[KittenChiu]

Thanks