Hi! I have a 10 gallon tank with two mollies and two guppies and recently,one of my mollies seeems to have swim bladder disease and i want to add slat to my tank (i currently do not add salt to the tank) to help my mollies live longer and better. My question is since i do have guppies is it ok to add salt to the water? Will it effect them in a positive or negitive manor? And where do i get salt like from the pet store or can i use the salt i use in baking at home? (i know its probably a dumb question but i really dont know!! I am a beginner btw) thanks!