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I'm with tank girl as far as water changes go; 50% or even more. I don't test (well sometimes I use the pool kit to check the pH), and I use my test strips (Mardel) to check the pool for total alkalinity. I have never had a problem with large water changes, but have had problems letting it go too long or not changing enough.
What he built is not really what I was thinking. Basically wooden boxes about the size of a cig pack. It will have a little pull out tray that will hold the vials when not in use. Then just pull out the vials and put them in their holes on the top of the box where the tests are marked. Basically something that I can keep 1 in each tank stand that corresponds to that tank. That way my Master Test Kit box isn't full of vials all the time.
I have a Mardel test kit and a few AF reagent kits. The NO3 test is totally out of wack! The Mardel strips read 40, and the AF kit reads between 10 and 20. Any sugestions????