I do not change water during the cycling process. I do think, however, that you need to be testing for pH, alkalinity, and calcium and adjusting accordingly.
Evaporation depends on far to many factors to provide a general rule of thumb. For example, my 54 evaporates more per day than my 180. The 54 has a fan blowing over the sump to cool the aquarium, which leads to more evaporation. And the 180 has a glass lid, which reduces evaporation. You just have to watch your system and learn what is normal based on your aquariums temperature and the humidity of the room.
and i am testing, except i need more test equipment, i don't have a calcium tester.
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