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Description:Simple assembly instructions: 1. Efficiently to separate the protein in the water, make it clear. 2. Advance the area of the oxygen in the water. 3. The increased foamy cup and air tube can avoid dirty things backwards. 4. Adapt good aquality materiales to produce it, very smooth and can avoid dirty things. 5. Easy assemble, stick on the inside aquarium and can work. 6. Clear and crystal, light and useful, won not affect viewing.