05-11-2011, 02:11 PM
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well I have a well so no chlorine, but I know lots of people that do the same with city water. Just add dechlor to the tank before you fill it up. Add enough for the full volume of the tank then just run straight tap to it. Dechlor works almost instantly. If you really care you can look around for some chlorine test strips to test your tap. Its fine if these are the cheap test strip or even the little paper strips as they are pretty low reading. Ones for pools would be best... prime gives you dosage based on ppm of chlorine... But either way it should be fine if you just dechlorinate the tank then add temp matched tap water straight too it. A lot of things are on your side TBH. The dechlorinator, diffusion of the chlorine from the tap(if you have say 1ppm in tap(which is pretty high) and do a 25% water, even without dechlor your tank only has a 0.25ppm concentration of chlorine), chlorine will gas off pretty quickly(chloramines won't though)... Then there is the stress concentration... small amounts of chlorine won't really harm anything but sensitive fish. Same for your filter bacteria. I know some people who run large fish rooms just do smaller water changes and if they have only chlorine in the tap they don't even bother with dechlor because of the diffusion then gas off.