Red sea coral colours d is a trace element complex that promotes the purpleblue colours in coralsr reef colours d trace elementsr promotescolour bluer contains 18 trace elements that are depleted constantly from the water and found in coral soft tissue and skeletonr red sea research has shown a direct relaitonship betweek calcium uptake and the 31 individual elements of the reef colour supplementsr can also be used as part of the stage 4 reef colours in the red sea reef care programth