Do you just use a singe light fixture or multiple?

Due to how the light can shine into the tank and how it makes any corals or fish inside, do you use a single light fixture or multiple that has different light colorations? This can help make the tank look less overall blue (if you want specific corals to shine) but also allow for other species to still pop when they swim by or move around within the tank. This can include smaller lights such as those that can be hidden underneath the tank's trim, or lights that are even placed inside of the aquarium water under the substrate, between rocks, etc.