Should i add salt to my tropical fresh water fish tank ?

wozz

New member
in my tank i have 2 Gouramies, 3 sword tails, 1 Siamese fighter, 2 silver sharks and a shark catfish, after buying the shark catfish i did some research and all the info says they like salted water, then after doing more research i found that a lot of people add salt to freshwater tanks because its beneficial to all fish, should i add salt and if so how much.
 
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