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 Mixing Your Own Saltwater If you have your own RO filter system, you must premix your saltwater before adding it to the aquarium. Begin by filling a 5-gallon bucket or larger non-toxic container (preferably with wheels) with RO water. Next, add salt to the water. Follow the instructions on the salt mix (Such as Instant Ocean), keeping in mind that a general rule is to add approximately one cup of salt to every two gallons of aquarium water. After mixing salt with the water in the bucket, use a hydrometer...