Red sea reef colors bioactive minerals supplement-d is part of the complete range of complementary major, minor and trace element complexes which together provide the needs of corals. Reef colors d supplement contains a blend of trace elements that are associated with many biological processes, one of them being the production of purple/blue pigments in the soft tissue of corals. To ensure coral health, the ppm level of these elements must be maintained within a narrow band and therefore should only be dosed according to a measured requirement of the aquarium. Trace element complex that promote the purple/blue colors in corals. Available in 500-ml bottle.