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Originally Posted by AngelLeah1981  Next question.....hmm.....For example: if I remove 10% of the water for water change - and there was already some water missing from evaporation - how would I know how much salt to mix not knowing exactly how much water is missing? |
You need to replace the water that evaporated with fresh water(no salt). Have a spot on your aquarium that you keep your water level at. Then you can do your water change. Consider buying a quality book.
You can get a RO/DI unit for $100.00.