Blackwater Extract contains trace elements, vitamins, and valuable extract of peat. It creates an environment similar to parts of the Amazon River and other natural, blackwater biotopes. Blackwater Extract promotes fish activity levels. When added to the aquarium a light yellow color will appear. It's an excellent conditioner for all soft water fishes including: discus, angelfish, tetras and killifish. Used by professional fish breeders to encourage spawning.