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Crystal clear water is the aim of virtually every aquarium owner. We are drawn to clear water as a species, we like to live next to it, swim in it, and of course, drink it.
Most fishkeepers know about the importance of cleaning filter sponges, and to only ever do it in old aquarium water, not tapwater.
Water changes are really important for fish tanks. They lower pollutant levels and can add buffers, freshening up the tank and aiding fish growth.