When to do a Water Change?
I had been doing a 25% weekly water change until about 2 weeks ago. My tank had always been cloudy/hazy so I decided to go longer without a wc to see what would happen, 2 weeks have gone by and my water is much clearer. I tested my nitrates today and they're 10 to 20 ppm. Since the nitrates aren't excessive, can I go even longer before changing the water? I read on Green Leaf Aquariums site under the PPS Pro info that sometimes the water in a tank can be healthier going without ever changing the water than if you were to change it. If your tank is heavily planted to where the plants are utilizing the bad stuff (ammonia, nitrates, mulm, excess nutrients, etc) then what would be the purpose of a water change?