10 example of air exerts pressure
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Answer:
et a clean 1 or 2 gallon metal container with a screw top cap. Put an ounce or two of hot water in it and place in hot sun without cap!
Put the cap on tight and immediately place in a very cool area. Soon the metal container will be crushed because the hot water vapor created by the container being in the hot sun will condense back into liquid leaving a partial vacuum in the sealed metal container.
The weight of the air outside the sealed container will crush it inwards.
ou don't need a bubbler (airstone) as long as you have some type of filtration. The filter will move the surface of the water and this is where oxygen is actually dissolved into the water - the bubbles don't do much because the don't have enough time in contact with the water before they pop at the surface. The air can damage or kill the organisms that live under the live rock if the air becomes trapped. I would disagree with saltwater fish not needing as much oxygen as freshwater, however. With the movement of waves from the wind and tides, saltwater fish are exposed to more dissolved oxygen than some of the freshwater fish. This is especially true of fish like tangs which are very sensitive to the amount of oxygen in a tank. So as long as you have a filter that will make ripples across the surface of the water in your tank (and maybe a powerhead to distribute the oxygenated water to the bottom if your tank is deep) it should be okay to turn the air pump off.
Explanation: