Can you use dissolved rock salt in your salt water aquarium?

Using dissolved rock salt in a saltwater aquarium is not recommended. Rock salt often contains impurities and additives that can harm aquatic life. Instead, it's best to use marine-grade salt specifically formulated for saltwater aquariums, as it ensures the proper balance of essential minerals and elements needed for a healthy environment. Always check product labels and choose high-quality salt designed for aquarium use.