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How often to do water changes if im cycling my tank with fish in it?

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i have a 20g freshwater tank with 2 goldies

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  1. hi i am a fish expert and work port time in an aquarium. do a 20% water change every 2 weeks that will give time for the cycle to grow and die then you clean out


  2. with all coldwater fish you change 30% of the water everyweek. hope that helps x  
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