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I did water change as usual yesterday, (about 90% )and cleaned one of the two Fluval Fx6 filters I have. The tank is 500 liter. The nitrate was higher than it normally is after a week, but I wrote it off to warm weather and goldfish having been fed a little more than usual. I decided to check the levels again today, however and they were back to about 15ppm (having hard time telling 10 and 20 ppm apart API freshwater test kit). So I tested the tap water and it is about 5ppm (probably little higher but 5 is closest) fresh from tap (I retested 2 times, made sure I follow directions to letter and even used fresh never used tube). My tapwater has always been 0ppm before this and never over 5ppm just before water change. Is there anything I can do aside from double dozing Prime daily until the tapwater resettles?
