are air pumps useful for tropical fish tanks?

Natalie W

New member
i have a filter, light, thermometer and heater, my tank is 28litre i think and i have 2 mollies and a fighter, 4 false plants and an ornamant, and if i do what air pump would i get if it is required.
its in the living room but the fish are lively enough and seem happy and i had 3 goldfish for 3 year in the same tank without the pump and they did fine.
 
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