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- The Island of O'ahu, Hawai'i
If I were to get a 60 gallon tank and fill it up with 15 of those 5 gallon saltwater boxes, will It keep adding the salinity? I don't know if I keep adding 5 gallons on top of 5 gallons of saltwater, it will read 1.032 on my hydrometer. Also, can I maybe use tap water conditioned with Instant Ocean Marine Conditioner then mix it with salt?