I am having some water problems with ammonia, everything else tests fine. The ammonia is over the top. (6.0)This is not a new tank, has been set up about 5 years, is a 55 gallon. I am taking out and replacing 25-33% of water every other day and it is not getting better. Am adding prime, added some ammo chips to my filtering system also. I was told by a health professional that Denver water is adding chemical to help with covid, I don’t know if this is true. I have had a spike before, but never anything I could not get under control. I don’t know what else to do. I have two pleco, 10 neon tetras and 3 small catfish. That is not more than 55 should support right? Can I buy water? Is that bad water for fish? We drink filtered. Any advice appreciated.