What is DO?

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Dissolved oxygen is DO. It is oxygen in the water. Different DO levels in the water can change into many colors when we add chemicals. It is an indicator. Fish use more oxygen at high temperatures. It is air for fish. DO is created by diffusion from the surrounding air. Overfertilization can reduce DO levels.

This is a picture of the DO criteria. It tells how much DO certain fish need.

This picture is from a different web page.
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