How Often Should You Change Aquarium Water?
While living in a tank, a fish or other aquatic pet has no way to swim away from fouled water to fresh. They are stuck with the water they are given. Even with a filter, water agitator and a protein skimmer, the water still needs partial changing on at least a weekly basis, according to “The Aquarium Book” (Frank Indiviglio, 2006). This is true for all types of aquariums.
