Light spectrum in ocean throughout day?

The spectrum will change more to blue as the sun lowers in altitude, to a point, due to the longer sight lines causing more water to effectively be between the corals and the sun, and because water absorbs red light. "To a point" as in once the sun gets low, light scatters in the atmosphere more in the blue and less in the red, so we lose that blue light intensity as the sun sets (hence red sunsets). The ocean begins to darken faster, at relatively deeper depths, than the sky would due to red light absorption in water once again. Opposite for morning. At least that's how the physics would work.