I may have been mis-guided at the pet store. I bought a Green spotted puffer for my 55g community tank, and the guy told me all I needed to do was add the right amount of aquarium salt, and ill be fine. He told me it was actually healthier for the other fish to have it in there as long as the chemistry was in spec... Well I have had my puffer for 7 months and everything is fine.... I have had a death but was due to violence with another fish... am I okay or should I change my fish water ect....