Well, the websites I looked at for nitrates said do not boil the water. It makes it worse since you are actually decreasing the water it increases the nitrates. The municipal water system only allows under 10ppm in their water. Anything over 20ppm can be a health hazard. Even reverse osmosis only gets rid of 85 to 90 percent of the nitrates if your system is working at optimum. We are going to pay for a complete water analysis and go from there. Probably an RO system in the house. In the meantime we'll bring in bottled water for us and I guess I will buy water for the aquarium as well. There is a chemical I can put in the water to clear the nitrates, but, it is really to be a temporary measure, not something you should do with every water change. Any other ideas?