Temperature affects the rate of O2 dissolving into water and how much total O2 can be dissolved at any one time.
Using airstone improves the surface agitation as well as air to water contact surface areas, helping O2 to dissolve into the water.
Both works in their ways to improve O2 levels.
Lower temperature also allows you to grow better and more varieties of plants and mosses.
For Crystal shrimps, the temperature should be lower than 26 and stable if you want them to be comfortable and breed.
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