My aquariums have an open space at the top of the sides for air let in and out. But the factory made aquariums I saw seem to be closed on all sides with tightly fitting lids and I wondered, how does oxygen get in? I know that airators are basically used not to supply oxygen but to let the water circulate so that more water comes to the surface and trap oxygen. If that is the case how do we let oxygen to the tank so that surface water traps oxygen?
well. aerators…aerate the water, so thats for putting air in the water. pumps circulate the water. and the closed lids are not sealed. therefore air is always circulating due to the water at the surface. and the holes in your lid are for chords and tubes from the stuff your using to keep your aquarium running
well. aerators…aerate the water, so thats for putting air in the water. pumps circulate the water. and the closed lids are not sealed. therefore air is always circulating due to the water at the surface. and the holes in your lid are for chords and tubes from the stuff your using to keep your aquarium running
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The oxygen gets in and the CO2 gets out by disturbing the water surface in any way. Just your plain hang-on filter does a good job at this, but if there’s a spot in your aquarium that doesn’t get much water flow, add a bubbler. Again, it’s not the bubbles that add oxygen to the water, it’s the ripples and disturbances the popping bubbles make at the water surface.
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The lids aren’t air-tight, so enough air gets in (and out) to allow gas exchange at the surface of the water.
Think about it. If the tank were air-tight, and you had an aerator pumping air in there, either the tank would explode, or the air would blow the lid off, or (most likely) the back-pressure would build up to be enough so no more bubbles would come out of the aerator.
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