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Filtration for 20 gallon tank :)


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so i want to have a 20 gallon planted community tank. i would like to use sponge filters and the usb nano air pump. i would like to have 2 filter but what 2 sizes should i get?(keeping in mind i can take one out to cycle another tank or for quarantine tub) also would i need to air pumps and 2 check valves?


Thank you for reading 🙂

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