01-22-2009, 01:44 PM
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If it was used as a saltwater tank, there's a strong likelihood that it's drilled. This means there are holes in it for plumping for the sump. You can either:
1) Plug the holes with acrylic panes and silicone and use standard freshwater filtration methods like power or canister filters
2) Take advantage of the tank being drilled and use a wet/dry filter. These filters provide massive amounts of biological filtration and can be great for things like big cichlids. A tank that size is capable of housing large fish such as wolf cichlids, if you're so inclined, so having that filtration option available is very nice.