09-20-2012, 02:15 PM
| || |
Originally Posted by Byron
As AD pointed out, the benefit here is increasing oxygen. When fish are under any form of stress, one way it affects them is by raising their metabolism so they require more oxygen entering the bloodstream. When there are more fish in the aquarium than what it can easily support, oxygen in the water will be less, making it that much more difficult for the fish to get more of it. Adding an airstone increases the gas exchange bringing oxygen into the water and driving out CO2. So in this sense, the fish is helped--but minimally. The stress caused by the overcrowding will still be present, and stress weakens the fish continually.
You might find this helpful: Stress and Freshwater Aquarium Fish
The main point is that overcrowding an aquarium causes trouble that will affect the fish and lead to disease and early demise, and there is absolutely no way to offset this except by correcting the stocking.
You make a good point with the Co2, the tank that was overstocked all live plants died. So I made a Co2 out of a 2 litre bottle.