The Ocean Nutrition Green Marine Algae has been designed to be used as a supplement to other foods and it can also be considered as a great holiday food. The seaweed can easily be placed into your tank or aquarium using feeding clips or by simply wrapping a piece of the seaweed (55 gallon community tank = approx 2 inches by 3 inches seaweed) around an elastic band and then attach the band to a rock in the aquarium so that your fish can eat at their own leisure, any pieces of the seaweed which come lose should be re attached to the rock and any pieces which are left over 24 hours should be removed. Ideal food source for:- Marine Tangs. Angels. Wrasses. Damsels. and some types of Butterfly Fish. And there is also available Ocean Nutrition Brown Seaweed. Ingredients:- 100% Natural Dried Seaweed, 100% Digestible and high in Vitamin C.