Hello ALL, Thank you for responding to some of my questions about RO water. A new problem has just happened to me and it is dealing with adding KNO3 to my tank. I am trying to get a better N reading and have been adding KNO3 powder and guess I over did it somewhat. I was adding it to the tank for about three or four days now a little bit at a time and then testing daily to get the nitrate level and it was reading a zero so add some more right. But, today noticed some ick or maybe some lymph outbreak on my discus so tested the K levels of the water and the were above three ppm or higher. From my readings I thought that high levels would be ok and not have a negative impact on fish but I know now that it does. My one discus is up at the top hurting because of the high levels of K so put a lot of carbon into the tank to pull the K out of the water hopefully it will be ok and the discus will make it. So, I have learned first hand not to have to high of a K level in a tank with fish in it. But, begs the question, what else can I use to bring up the nitrate level??? _______________________________________________ AGA-Member mailing list AGA-Member@thekrib.com http://lists.thekrib.com/mailman/listinfo/aga-member