Sulfur hexafluoride (SF6) is an inorganic, colorless, odorless gas with a density of 6.12g/L, which is ~5x higher than that of air (1.225g/L). When mixed with air, sulfur hexafluoride will sink to the bottom much like water mixed with oil. The bubbles, which are filled with air, therefore float on top of the sulfur hexafluoride filled aquarium.
Source: https://youtu.be/GutiNPwzUA8
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