Originally Posted by Lupin
Mineral salts for African cichlids, not marine nor aquarium salts but mineral salts are still useless IMO.
Not entirely true. And I don't see any, nor have I found any, sound basis for the opinion. I research the statement for couple of hours before posting.
Most fish must have some minerals and dissolved salts in their tanks. Even waters containing tannins and having an acidic chemistry have some dissolved minerals and salts. Not having salts and other minerals in your water would be like placing your fish is unmodified RO water and that is not good.
Although most fish do not do well, even to the point of not tolerating any saline conditions at all, some degree of mineral salts are found in all water. Some micro nutrients are absorbed by the fish from the water. Some of these elements help to maintain the fishes electrolytes. Electrolytes maintain and regulate the metabolism and general health of any living creature.
Aquarium salt is used widely in the hobby as a treatment for some diseases. It must be said, though, that there are many scaleless fishes, and some with scales, too, that will not tolerate salt in any form, care should be taken when using it. Although they may tolerate the medication, they may stress from it too. I'd guess in such a case that the term tolerate is a relative term. Let's just say here that the treatment can be almost as bad as the disease itself. Almost. A little stress would be better than death, one would guess.