Tank size: 250L
tank age: 1 Year
pH: 7.4
ammonia: 0
nitrite: 0ppm
nitrate: 20ppm
kH: 240 ppm (mg/L)
gH: 180 ppm (mg/L)
tank temp: 24C
Fish Symptoms (include full description including lesion, color, location, fish behavior):
I have had a large amount of my molly fish get very ill. I'm not...