Algae would be something you find in swamps or in an underground water source. It spawns on the blocks around the water and floating on the water. When you are sprinting on a block with algae you will slip because it is slippery. Also you can mine algae with anything (including your fist) and you will gather it. You can place it on a block or eat it. When you eat it you get 3 hunger bars.
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