Green Seaweed (Porphyra yezoensis), Purple Seaweed (Porphyra umbilicalis), and Red Seaweed (Palmaria palmata) are ideal for marine herbivores such a Tangs, Surgeonfish, Moorish Idols, Parrotfish, Angelfish, large Butterflyfish, and herbivorous freshwater fish such as Cichlids and Goldfish. These super nutritious seaweed packs are completely natural.