Tank question

[Hi all,

I am upgrading very soon and need some help. Is there a difference between saltwater rated tanks and freshwater tanks? If so what are the differences? Thanks!!]
 
[A reefready tank is probably what they are calling a saltwater tank. A reefready tank is a tank with built in overflow boxes and predrilled holes in the bottom for drain lines and return lines going down to a sump.]
 
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