Dear Pufferpunk, I have a 10 Gallon tank with 2 Black Mollies and a Violet Goby (Dragon fish). I am using Instant Ocean Marine Salt. The Dragon goby is small right now but will be transferred to a larger tank in about 6 months. The pet store has the Blue Paradise Gourami marked as “requiring salt.” I put them in my brackish tank after acclimating them and the next morning they were floating on the top. They were not dead, so I put them in a hospital tank with very low salt and they have since perked up and have their color back. I will not put them back in the brackish tank but will slowly acclimate them to the freshwater tank. Thank you very much for your help. Karen