06-19-2008, 05:06 PM
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Well, multiple filtration systems is always the way to go, especially on a large tank. Generally it's good because if one blows out you're not completely out of luck.
Also, it would mean you'd be doing a little maintenance each time, instead of having to clean out one gigantic filter. In fact, I think you'd be hard pressed to find a single filter that would work for a 500 gallon tank.
Wet/dry filters or sumps are commonly used for large aquariums like this.
If you're looking for low-maintenance tanks in general, the aquaripure system is very good, as it removes nitrates which greatly reduces the need for water changes (which is obviously a big deal with 500g!). I'd combine that system with a high rated (as in as many gallons per hour as possible) canister filter. Aquaripure is actually a sponsor of this website, here's a link to their section in our forum, you can post and ask questions there about that particular system if you're interested. I'm sure they could help you figure out what supplemental filtration would be needed if you went with them: http://www.fishforum.com/viewforum.php?f=108