Vet Q & AHow much sea salt to mix for my saltwater aquarium fish?
If your are using a product such as Instant Ocean ( www.instantocean.com ) or Reef Crystals ( http://www.instantocean.com/Products/Sea-Salt-Mixes/reef-crystals-sea-salt.aspx ), then directions will be on the container. Other products may also include instructions.
The amount of sea salt will depend on the specific gravity you desire. Ocean water, or water used in marine tanks, has a specific gravity of 1.025, so you will need to dissolve enough salt into a quantity of water to reach that level. You will need to allow for 24 hours to make sure the salt has completely dissolved.
If you want a step by step guide, click the link below.
http://www.saltwatersmarts.com/guide-to-mixing-saltwater-517/
Updated on September 24th, 2025
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