My first pet fish was also 50+ years ago, I have made a lot of mistakes over the years, but I try to never repeat the same mistake twice.
Water from an established tank is little more than dirty water. The "good" bacteria would be in such a small quantity that it's contribution to a new cycle would be next to nothing. Many times over the years I have set up new tanks with 100% de-chorinated tap water, and a well seasoned established filter. (or borrowed media from my various filters) In some cases this was on new tanks, with no decor, and no substrate, (qt tanks, or temp holding tank) so 100% of the bacteria was in the filter itself. As long as the bio-media is large enough in quantity or sq footage, and established enough to handle the incoming bio-load of new fish & food, no problems. The result is an instantly cycled tank. It wasn't that many years ago that people would jump all over me on forums when I described this method of instantly cycling a tank. Many people felt that I should be using dirty water from an established tank. Many probably still do.
Unless I have some kind of specific reason for doing so, I don't take readings of any kind on my tanks.
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Jeff, I have no idea what you are referring to? The topic is regarding cleaning bio-media, to which disinfectant type, residual levels of that disinfectant, and contact time all come into play. No one has said that what you personally do, at your location, with your tanks, is wrong. I can only assume that you are seeing things that aren't there.
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Amy - it appears that your seasonal average is approx. 1 ppm of chlorine, with a seasonal range of .6 - 2.05 ppm. In my books, 1 ppm chlorine is pretty low, but personally I would test at my taps on a regular basis just to follow the high/low swings at user end. I would assume that during heavy rains/storms is when the disinfectant residuals climb to the max of 2 ppm. So that gives you an idea of where to start, but with chlorine how far away you are from where those numbers are being taken, could vary the chlorine residual at your taps quite a bit. At your taps, you could have a much lower residual. Impossible to say without testing. Again, this explains why some folks can get away with rinsing under the tap without any noticeable difference in their nitrification cycle. As long as nothing changes in disinfectant type or quantity, you are good to go.