Also known as Boulder Coral, Mayer's Coral.
Found in massive colonies, over reef rims and reef tops, on calm, shallow, upper reef slopes of lagoons, coral and rocky reefs. Not very common but distinctive.
They feed on plankton.
Length - Spreading
Depth - 0-40m
Stony corals have hard stony skeletons, their polyps have six tentacles or are made up of multiples of six. These are usually nocturnal, however if the sky's are overcast, then many will feed during the day.
Generally the more robust corals life on exposed areas, while the smaller corals live in sheltered lagoons or deeper waters.
Stony corals are reef building corals and embedded in their flesh are thousands of minute single-celled marine plants called zooxanthellae which accounts for their colour.
These corals support a huge diversity of life, their main predator being the crown-of-thorns sea star. Ref: https://www.sealifebase.ca/summary/Coeloseris-mayeri.html