Tank size: 26 gallon
pH: 7.5
ammonia: 0 ppm
nitrite: 0ppm
nitrate: 20 ppm
kH: 140
gH: 75
tank temp: 78
Fish Symptoms (include full description including lesion, color, location, fish behavior): It is a neon tetra that start behaving oddly this last week. He does not always school with the...