Can you use table salt to make saltwater for fish?

No, table salt is not recommended for making saltwater for fish. While it is true that table salt contains the same chemical compound as sea salt (NaCl), the impurities found in table salt can be harmful to fish. Table salt often contains additives like iodine and anti-caking agents that can alter the water's pH levels and irritate fish gills.

For accurate and safe saltwater aquarium preparation, it's essential to use marine-grade or aquarium-specific salt mixes. These salt mixes are specifically formulated to replicate the natural composition of seawater and provide the necessary elements and minerals required by marine organisms. They ensure the proper salinity and ionic balance, creating a suitable environment for the fish and invertebrates in your aquarium.