With a tank that size (I assume you're talking about the 350gal you're gonna get?) the only way to go, really, is a wet/dry filter. They're based around a sump that should be about 1/4 the volume of your main tank. You stuff that with bio and mechanical filtration aids (ceramic rings, filter wool, sponges etc) and attach a large pond pump. Well, there's a little bit more to it than that, but those are the basics

You can also buy wet/dry filters, several companies that make canisters also make wet/dry filters, but I believe they can be quite expensive. With wet/dry's you're looking at the volume of the sump, rather than the gallons/litres per hour. Do a search on DIY wet/dry filters and I'm sure you'll find plenty of info
