Tank size: 20g L
pH: ~7.4
ammonia: 0 ppm
nitrite: 0 ppm
nitrate: 10-20 ppm
kH: ~60 ppm
gH: ~110 ppm
tank temp: 76F
Fish Symptoms (include full description including lesion, color, location, fish behavior):
Within normal limits until today. Swimming towards the top of the tank, and seemed to...