Randy Holmes-Farley
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Depends on why they are not so colorful now. 
One thing people often do to counter very low inorganic nutrients is to feed organics to the corals. Various sorts of coral foods. The Red Sea product includes some of these, but there are many brands.

One thing people often do to counter very low inorganic nutrients is to feed organics to the corals. Various sorts of coral foods. The Red Sea product includes some of these, but there are many brands.


