How To Cycle A 20 Gallon Fish Tank?

Set up the tank with filter, heater, substrate, and dechlorinated water

Run the filter and heater continuously

Add an ammonia source

Test water daily for ammonia, nitrite, and nitrate

Keep ammonia present until nitrite appears

Keep testing until ammonia and nitrite both reach zero within 24 hours of dosing

Wait for nitrate to rise during the process

Do partial water changes if ammonia or nitrite get too high

Add beneficial bacteria starter if desired

Do not add fish until the cycle is complete

Add fish slowly after cycling is finished

Continue regular water testing after adding fish

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