BIOACTIVE ELEMENTS SUPPLEMENT TRACE COLORS DTrace element supplement that promotes the Purple Blue colors in corals Blend of 18 essential trace elements BIOACTIVE ELEMENTS Supplement is part of the complete range of complementary major, minor and trace element complexes which together provide the needs of corals. These 18 elements (out of all the trace elements in NSW) participate in the metabolic processes inside a corals skeleton and soft tissue, one of them being the production of the purple