There are TONS pf corals out there that are not green. Acans, favia, chalices,zoanthids, paly's, and plenty of acros and montis. Lighting has a a lot to do with colors as well. What bulb and ballast are you running. With a 400w halide over a 75g you can easily go with a radium 20k and you will be amazed at the way the colors pop and you will still have plenty of par for growth. Here are some examples...
There are 100's mroe examples I can show but this should give you an idea.
There are 100's mroe examples I can show but this should give you an idea.