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You do know that you need to replace water lost due to evaporation daily right? You need to use freshwater (RODI or distilled rather than tap). The water evaporates but salt stays. Assume you know this but just in case.
An auto-top-off (ATO) system is probably the most useful thing after a skimmer for overall tank health. Keeps the salinity level and system volume stable.
-droog
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