These corals get their common name from the grooves and channels on their surfaces that look like the folds of the human brain. There's more than one kind of "brain coral"—several species from two different families of corals share the name—but all help build coral reefs.
While staghorn corals grow rapidly to gain new territory, slow-growing brain corals rely on brawn. They hold their ground by being solid and strong enough to withstand the storms that pound more delicate corals to rubble.
Your underwater photos are simply amazing! What wonderful work!
I tried a few underwater shots (August 17, 2008) and discovered how truly difficult it is.
I don't know how you'd ever get the true colors without all of the blue overtones but you've done a superb job.