Well, I am at start over again. The city water here is so bad it won't allow tank to build up bacteria in it. Most of those who don't live outside of the city enough that there water isn't as bad. I bought a R/O water filtration unit for this issue. For those who know what a R/O unit is, It has the long name of Reverse Osmosis system filter. People use them for drinking water and i will be doing that but also for pure water for a fish tank as well. We, (the fish store) and i have tried about everything to no help. So this is the last hope. Have my fingers crossed!!!! Will let you know how it goes, WD66