02-16-2009, 08:36 PM
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Salt is not good at all IMO. It raises the hardness of the water, which can be terrible for many popular fish. It also weakens the fish's Osmoregulation system. Osmoregulation is basically how fish transfer salt in and out of their body. In new systems where people *want* you to add it, it may make fish relax, but the outcome of this is it weakens the fish's slime coat. If salt is added over and over, the slime coat is weakened and weakened, making the fish weaker. The overdose of salt eventually makes the fish unable to process it through its gills, which makes it incapable of getting rid of excess water.
I think that is the scientific way of explaining it...