06-20-2012, 02:48 PM
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Originally Posted by AbbeysDad
There is always some gas exchange at/on the surface of the water. Carbon dioxide (CO2) is exchanged for oxygen (O2). The exchange is greater with surface movement, turbulence or waterfall like disturbance.
An air pump and air stone does not put oxygen into the water, but the oxygenation happens when the bubbles break the surface and CO2 is exchanged for O2.
Water circulation is very important. Surface turbulence requirements vary to have sufficiently oxygenated water.
I agree with much of this.
An air pump, or airstone can help move water lower in oxygen from the bottom of the tank to the surface for better exchange,and also can help disperse heat.
Once read an interesting thread over at the Krib.com where test's were done with DO(dissolved oxygen) meter with, and without air stones, and measurement's of dissolved oxygen taken at bottom were much higher than same measurement without the added airstones.
Even powerheads created higher reading's for dissolved oxygen over tanks without such apparatus at the bottom of the tank.middle,and top.(maybe somthing to try ones self?)
For planted tank's,,I think there is enough oxygen produced during daylight hours to hold the fish over till morning when plant's once again begin producing O2 so long as tank is not too over stocked.
Just my two cent's.