Not sure if it's already been said but get a tank that is designed for saltwater. Meaing with holes in the back glass so your filter can run underneath the tank. If you use filters that hang off the back you will get salt creep like you wouldn't believe. I made the mistake of trying to convert a 55 gal freshwater to salt.
Then as everyone said, there is the expense. And I have not ever seen a place that gives you a guarantee on saltwater fish like they do fresh. So in other words when that $100 fish you just bought dies a day later you're ****ed.
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