great question...
Back in the 1990's if we wanted to keep SPS we had to set up a special tank with no fish and never feed it. This is how we kept them colorful back then... If you fed the tank or added fish the corals would go brown. We had no easy solutions for NO3 and PO4 back then. So we starved the tank.
Now we can absolutely crush nutrients with products like ecoBAK and GFO and high quality protein skimmers. Today we can take a system too far reducing nutrients. So... FEED YOUR TANK. Add some Amino Acids... a PALE coral is a hungry coral. In the past these nutrients would make for healthy coral but they'd be brown because of the PO4/NO3 level in the water. Now we can keep "end product" nutrients super low while feeding a system. Use high quality foods like Reef Nutrition and high quality, high performance Amino Acids.
So the secret to a 2012 reef aquarium? Crush the PO4 and NO3, feed the system with quality foods, skim like crazy, maintain your water parameters, invest in a handful of ecotech or tunze's and employ powerful lighting. Done deal.