Overflows, sumps, and wet/dry filters are high-level stuff that is necessary for salt water. I understand they make excellent freshwater filtration as well. Better than canister filters, even. If the tank was used for salt, you may need to change some of the media out and rinse out the rest. If it was run fresh, you may be good to go. Try to find a manufacturer/model no. But if you can't, post the best pics you can and maybe someone here can help you with set up.
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