The left photo shows an incredible frag tank with at least >50 various zoanthids species. The tank owner uses one Blaze M-60S unit and one ComboRay CR-60 unit as the light source of this tank. According to the owner's observation, it is said that almost all of the zoas kept in this tank became more intense in color after the addition of the CR-60 unit. There is no doubt that the 420nm Violet as well as the 500nm Cyan brought out rich colors of the zoas. This tank has been kept under the fixtures without turning on the white light for at least 6 months. The colors went better instead of worse. This should be a practical evidence that colors of zoas could be maintained with "appropriate" light spectra. If you have a frag tank that needs a nice light fixture, go for ComboRay! You will never regret!