IMO, TDS isn't the debate. After you add salt, your TDS is through the roof. The concern, at least for me, is that with tap water, you don't know when it changes or potentially becomes contaminated in some form. The key to a successful reef is consistency, and RO water adds to this consistency. On a typical day, all things appeasing the reef gods, tap water is perfectly safe. Just not the best. There's really no debate here, just preferences on tank stability and willingness to take risks, however small.
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Brad
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