11-20-2006, 01:15 PM
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Once a week is usually the norm for WC (water changes) and/or Gravel vacs. With adequate filtration, ammonia and nitrIte levels will remain safe with extended periods between WC/Gravel vacs, unfortunately, this only increases the nitrAte levels. Low levels of NitrAtes are usually safe and less stressful to most fish.
Using a proper water test kit, an increased amount of ammonnia, nitrIte and/or nitrAte levels can commonly and easily be removed by water changes, but can also be removed with products, such as carbon, zeolite, nitrite/nitrate removers, etc.