DENDROLOGY

Detailed explanation-1: -Increasing water movement is the quickest way to increase oxygen (O2) levels in a fish tank, as it allows more O2 to dissolve and carbon dioxide (CO2) to be released. This can be easily done using an air pump, performing large water changes, manually stirring the water, or placing a fan near the aquarium.

Detailed explanation-2: -Another excellent source of oxygen in an aquarium, and in many natural bodies of water, is plants. Plants produce oxygen as a by-product of photosynthesis, a process by which plants use light energy to produce food from carbon dioxide and water.

Detailed explanation-3: -You can add oxygen to your tank by slowly pouring water into it from some height above. The water will pick up air en route as well as drive oxygen into the tank water. How much oxygen is added depends on how high above the tank you pour the water and how many times you repeat this procedure.

Detailed explanation-4: -Signs of Low Oxygen They will swim less vigorously and even eat less often. As oxygen levels drop further, the fish will begin to show labored breathing and more rapid gill movements as they desperately attempt to get enough oxygen from the water by passing more water over their gills.