09-22-2008, 12:15 PM
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Build your own? Like from scratch? The only time I really know of people doing that is if they have a sump filter. However, you'll still need to buy all sorts of pumps, etc. Generally, especially for a freshwater tank, a few canister filters will do you well and end up being easier and cheaper.
You'll need to buy a couple of filters, to get adequate filtration for a 180G. Rena, Ehiem, Marineland (Magnum) are all good brands. Look for the GPH (gallons per hour) rating. You'll want the total GPH rating of all your filters combined to be at least 800 GPH or so. Of course, this all depends on your stocking levels, but at the bare minimum your water should cycle through at least 4 times per hour.
The Fluval Fx5 would be adequate, but running just that would be risky, as you'd be in big trouble if something went wrong. Combining it with something like the Magnum 350 should leave you all set.