Originally Posted by Caliban07
Can someone please explain to me which whether or not air stones add oxygen to the water. My understanding is the the air is trapped in the bubble and us released at the surface. Does a sufficient amount of gas exchange occur here that oxygenates the water? And if minimal, would this constant action be enough to make a difference to the oxygen levels?
Is it better to use a power head to cause surface movement to aid oxygen levels or if parameters are good. Is there any need to use any? I guess it all depends in stocking levels plants etc but what are your thoughts?
I'll take a shot at your question. Airstones are mainly for show. The tiny bubbles have no surface area, so when they rise to the top, they make tiny waves that really don't do much to mix oxygen into the tank water and allow carbon dioxide to escape (gas exchange). Even a lot of tiny bubbles don't do much. It would be better to remove the airstone and place the end of the plastic tube at the bottom. The much larger bubbles will move the surface water and create the surface movement you want.
You don't need the airstone. A good power filter with a gallon per hour rating (gph
) of 4 to 6 times the volume of your tank in gallons is all you need. Add large, weekly water changes to the mix and your fish and plants will be healthy.