I agree that for injuries using salt has some purpose. People seem to have good results using it for that. And for ich, obviously, that's a strong medical reason. But assuming no medical reason, why use salt? I just don't see the reason.
As for fish being more active, everyone has a tendency to see what they want. Not like a delusion and not intentional, but we all tend to shape memories and experiences to fit what we want them to be. That's just how we all seem to be built. That's why placebo is a real thing.
It might be true that salt makes fish more active (or just the opposite), or it might be that people want to think that. Who knows unless some controlled studies are done?
And who knows what the long term effect of constant low-levels of salt are to freshwater fish?
i dont' disagree, in fact i read that if the salt level is low it may actually make the bacteria tolerant to salt and a salt treatment will be less effective...
but i have to say, since i start using salt, i have no more issues with wounds, whereas before i started using salt, the wounds would actually generate to some other diseases and i will have to start QT the fish...
but i am still half minded if to dose salt on a regular basis or should i do it on a necessary basis