So about a couple days ago one of my discus started acting weird it had started to slowly isolate itself from the other discus and stop eating about a couple days ago. I am not really sure why I had this discus for a while with my other discus. My water is usually very hard and I never had any issues with fish being affected by the hardness. My tank is on a bit of the overstock I would say but I have not had any ammonia spike. Could it be infected or sick?
nitrate 20 ppm nitrite 0 hardness 300 ppm chlorine 0 ppm kh 80 ppm ph 6.8 ammonia 0
