Why can't aquarium salt be used for a puffer fish to make brackish water What is the difference between aquarium salt and marine salt What happens if aquarium salt is used instead of marine salt?

Aquarium salt is manufactured for different reasons than making your aquarium the perfect environment for salt water fishes. You may use it in an emergency, but long term is harmful to your fish. Marine salts contain the necessary salts and minerals that fish need are the best salt to use.