The Ocean Nutrition Red Seaweed is also available along with the Brown Seaweed and the Green Seaweed, and is also suitable as a supplement in addition to the food your would normally feed your fish but is great to use as an colour enhancer for Damsel Fish, small Angel Fish, Sponge Feeders and other fish with softer mouth parts. It is recommended that you should attach the seaweed to feeding frenzy seaweed clips, or that you use another form of feeding such as folding the seaweed around an elastic band and then attaching the band to a rock. For a community tank of 55 gallons you would look to place a 2 inch by 3 inch piece of seaweed into the tank. If after 2 hours there are still pieces of seaweed remaining you should remove and dispose of them. Ingredients:- 100% Natural Dried Seaweed, 100% Digestible and high in Vitamin C.