You need to test for Ammonia, and Nitrite to start with and write these numbers down to keep track of them. I test the first few days to get an idea of where the numbers are at. Then you can test once or twice a week. When both these numbers are at 0, then test for Nitrate. When all three are at 0 then the tank is cycled. Then you can slowly add one fish at a time. I do not do water changes during the cylce period, but some do. If you do it will prolong the cycle though.
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