Live coral?

[argan]

Many coral skeletons take on a greenish tinge after all the flesh has decomposed or been eaten. They go green, then brown, then coralline can take over. The coloration is from different strains of bacteria. My buddy gave me his lobopyhlia skeleton and a hammer skeleton, and both had same color.

if it were alive but without zooxanthellea it would be whitish and flesh still visable.