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Originally Posted by vertex
Hey ashera,
yes, a skimmer will definitely add O2 to the water as they all use air bubbles to help pull out the proteins in a tall water column.
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Air bubbles travelling through a water column will NOT add oxygen to water. The simple priciple of surface tension keeps the bubble intact. If the the bubble gave off oxygen it would dissolve before reaching the surface. Only surface agitation adds oxygen to water. This is a scientific fact.