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Mollies and swords would deal okay with salt (the mollies actually might be a bit happier, depending on your original water chemistry). The shark and eel, on the other hand, would likely not. The glofish would probably keep plugging along no matter what.
My opinion on aquarium salt is that it depends very heavily on the fish that you have and what your original water chemistry is. I have a mollies-only tank that I've set up as a brackish tank. My other tanks don't have salt anywhere near them. This is because mollies naturally live in water that ranges from almost salt-free to nearly marine, while the rest of my fish live in freshwater. I also have very hard water, which means that my fish that prefer hard water have what they need, I don't need to add anything to make the water harder (which is what aquarium salt does, it evens out osmotic stress for normally hard water fish). Of course, there is now freshwater additives made to harden water without salt, so aquarium salt has much less of a purpose.
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