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Sorry that was learned the hard way. Hopefully your shark will be okay. At least it was a fin and not a fleshy part of the body. Those beaks can shear through flesh and bone like nothing.
The aquarium hobby magazine I get periodically had an article about keeping puffers with other fish, and across the board, they said "it can work, but be prepared to split them up."
As far as the salt goes, I want to clear a few things up. Aquarium salt and the salt that puffers need are two different animals entirely. Aquarium salt is made for treating fish that are ill with parasites or fungus or that are suffering from osmotic stress due to soft water (and there are now better ways of dealing with all three issues). The salt that puffers need is a milder solution of marine salt, as they live in estuaries between river and sea. Butterfly is right that any salt is going to stress fish out, especially if you already have hard water or if they're softwater fish (and many cats, such as cories, are softwater fish). Aquarium salt, in the long run, would not have the trace minerals that puffers need to feel happy and healthy.
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