no, you should just not use it ALL THE TIME. that is a waste of money and harmful because it breeds salt-resistant diseases and parasites. salt is great for short-term treatments for things like ich, and as a way to temporarily help fish deal with stress (it makes osmoregulation easier by bringing external salinity closer to internal body salinity). I don't buy "aquarium salt" because it's just NaCl, table salt. I use table salt also because it dissolves easier, due to the smaller grains.