I've tried my hand at the longer lines and ended up with air traps, so I think I'll go with the 90's like Flybox shows.
Last set I ordered from Amazon they were too big - didn't pay enough attention to the hose diameter (my bad), so I like the idea just never used them.
As for your comment Scott, don't get me wrong, nothing beats a properly maintained tank. I personally don't like the internal filter, and an external filter is a cheap insurance policy. That said - I prefer that the filter stay as clean as possible.