One Gallon
How often should I do water changes of 20 gallons with a fish?
With the tanks do a water change of 25% per week. Without But I'll spend my Amazon Puffer planted to 20 gallons. There will be no filter. It seems as if it had to do water changes by week with that. Could you do one every 2 weeks? Or maybe even 3? Thank you.
Test water for ammonia, nitrites, nitrates and each week after a water change. Find out how long it takes for the water chemistry becomes the (dirty) and that's how long you can expect to change. This may seem confusing. So, for example, cleaning the tank now. Then test the water. Now try once week when the ammonia starts to rise, it is time to change the water.
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