Giant duckweed is the bigger cousin of regular duckweed, each leaf is about the size of a small fingernail. It floats on the surface, absorbs excess nutrients, and provides shade and cover for fish and shrimp. It multiplies quickly, so you will have a self-sustaining colony in no time. Easy to manage, just scoop out the excess regularly.
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in my eternal war with my goldfish, this giant duckweed is holding the line... for now! great healthy plant, large amount, immediately started spreading on the surface of the tank. great!