Fluval Sea Trace ElementsOur Fluval Sea Trace Elements provide a concentrated blend of 11 key trace elements in naturally-found proportions present in seawater. It supports essential biological processes in marine aquariums. Fluval Sea Trace Elements contains high quality and ultra pure trace elements, which ensure that you're getting a pristine product that's free of unwanted contaminates. It does not contain gluconates, nitrates or phosphates. Fluval Sea Trace Elements is strongly recommended to offset constant depletion of trace elements by protein skimming, chemical filtration and natural ongoing biological processes.