How to Make Saltwater for a Mini-Reef

Coral reefs are vibrant ecosystems teeming with life. Colorful and diverse, natural coral reefs in the ocean support millions of species of marine life. While it is easy to assemble a saltwater aquarium to keep live oceanic fish species, many users choose to grow a coral mini-reef alongside their beautiful saltwater fish. Regardless of whether you grow coral or not, the saltwater's preparation is a crucial component of a man-made saltwater ecosystem. Follow these steps to make your saltwater and you are sure to build a mini-reef that will last for years to come.

Things You'll Need

  • Dechlorinated or reverse-osmosis (RO) freshwater
  • Synthetic salt
  • Large mixing container
  • Refractometer
  • Aquarium powerhead
  • Water heater
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Instructions

    • 1

      Fill a large container with freshwater. Ensure that the freshwater is either dechlorinated or has been through a reverse-osmosis (RO) process. If you use RO freshwater, make sure you aerate it for 12 to 24 hours before use.

    • 2

      Add the synthetic salt to the prepared freshwater. Carefully follow the manufacturer's instructions when mixing the synthetic salt.

    • 3

      Test the salinity of your mixture. Using the refractometer, ensure salinity is between 27 to 35 parts per thousand (ppt), or measures 1.020 to 1.026 specific gravity.

    • 4

      Place the aquarium powerhead into the saltwater mixture and allow it to cure for a minimum of 24 hours before you use it in the aquarium.

    • 5

      Install a water heater in the container. You want your saltwater to remain between 75 degrees F to 80 degrees F.