I have a 175g tall tank with 16 discus in there. I dont know why or what makes them start pepering. It is really bad. I will post some pic. later. Water is fine, Ph 6.5, nitrite 0, ammonia 0, nitrate 10ppm. I change the water two times a week, 50% at a time. I use tap water. I got them when they are baby about 8 months ago. I got them from Jack Wattley. Any info or help you guys can give me?? 



