Colours of the Sea

This picture is to illustrate the wonderful colours of the coral reefs.
The Crinoids can be varied in colours, but not sure if they are all of the same species or different species.
They can be found in white, black, brown, orange, yellow, green, blue, red and in combination of colours.
They also host some Crustaceans - Shrimps & Crabs which also takes in the colour of their Crinoid host.