When I first got my 265 gallon tank, my LFS sold me two Eheim 2228 canisters for it. In truth, they were enough. My filtration has long since exploded/expanded since then, but, only because I am a filter-junkie!!!
My stock was excessive, yet, the two filters were adequate. I'm actually considering selling some of my filters so that I have less to maintain.
Remember, for any setup, you mileage will vary.