How often should a person do water changes with a Eheim filter system and a skimmer on a 55 gal. tank ?
< Check the nitrates. When they get above 25 ppm then they need to be reduced with water changes. Assume that your tank produces 10 ppm per week. At the end of week one you have 10 ppm and don't need to do a water change. At the end of week two you have a 20 ppm nitrate level. At the end of week three you have a 30 ppm nitrate level and need to reduce it with a 33% water change. By changing approximately 20 gallons of water you will reduce the nitrate to 20 ppm. Is 20 gallons of water per week too much work? Then reduce the amount of fish and add some live plants.-Chuck> Water Changes and Gravel Cleaning 1/22/06 Hello WWM Crew (and thanks for all the information you provide), I have a very basic question and forgive me if it seems ignorant, but I’m a little confused! On some of your advice responses regarding maintenance of freshwater tanks, I see that you inform people to do regular water changes, and gravel cleaning. Wouldn’t these qualify as the same thing? Because with my tank, I v
