Bayinaung
Aquarium Advice Activist
I recently got a mature nano 10 gallon tank from an enthusiast. I noticed that in my apartment the water (open top, good flow) top up is coming to about 6-7 liters a week or about 1.6-1.8 gallons. That's more than the 10% water change per week that's recommended. If I'm topping that much, how often should I change water?