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Tank size: 20 gallon tank age: 7 months pH: 7.4 ammonia: 0 ppm nitrite: 0 ppm nitrate: 20 ppm tank temp: 74 F (unfortunately I do not know the kH or gH of the tank) I've never posted on a fish forum before but I felt it necessary due to this recent event that has me absolutely stumped. I just...