How can i get better color out of my corals?

Understandable on the low nutrient comment which many have noted, but what defines a low nutrient system or how does one create thus environment?

Besides the listed: "Elos Filtra M (zeolites), RB 10 &20 (aerobic bacteria and food source) as well as Omega and Pro Skimmer (both coral foods, amino acid complex)" What are other types of food for feeding corals?
 
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