Do yourself a whopping favor...
Forget the Fluval and get yourself a sump. With a tank that big for that kind of environment, you're going to want simplicity and volume. Canister filters trap alot of waste debris in the mechanics and the hoses. Something you want to avoid when dealing with coral. HOB
filters do the same. Sumps are spacious, cleaner to run and easier to tend to. You can create a refugium in the sump and keep the Bakpak on the sump (past the refugium part). Heaters can be kept in the sump instead of in the tank. Very easy to fit any special media you may need in the future. It'll save you money and grief in the long run
Well worth the investment and time.
We, as a people, know so much more about outer space than we do about our own oceans. This lack of knowledge can very well spell the dangers that lay in wait for us.
The oceans surely would swallow us before a rock comes down to smite the planet of it's life.