Green light is not just for aesthetics. Green is very much in the spectrum used by plants and will promote growth, possibly as much as red light. Look outside at all the green around in our world. That green light would be reflected in most fish's natural environment as well.
Here's an example of the lighting program I'm running. I use white with green the first part of the day, then fade out the green and bring up the red in the evening. Thinking behind this is that skies are often orangish red in the evenings and at sunset, so trying to replicate that color cycle. The white comes down mid-day as this allows me to leave the lights on longer without an algae outbreak and no one is home during that time anyway.
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I keep blue very low throughout the day since it has no value other than bringing out some color in the fishes. And I have a 25min period of only slight blue after sunset just to watch them wind down. Though at the first sign of algae that will be gone.
