Air pumps can be used in two main ways in the aquarium: either to power small internal filters and undergravel filters (UGF) or for aeration only, using airstones. When used to run UGF (by placing the airline in the uplift tube), an airstone should be attached to increase the number of bubbles and hence water movement.

Having a well-aerated tank will help stabilize pH level and provide the necessary oxygen for respiration.