I want to put this setup indoors and don't really like the idea of perching the entire tub on a raised platform (e.g. breeze blocks) in order to be able to use a canister filter (e.g. xp3) that must be placed a certain distance below the tank for maximum efficiency. The tub full of water alone is going to weigh over 1000lbs so I don't want to add a bunch of bricks to that!
So instead I was considering a pond pump that could be placed inside the tank along with an internal or external filter.
Something like this pond kit maybe: http://www.bigalsonline.com/BigAlsUS/ctl3684/cp18614/si1382356/cl0/supremepondmaster1250filterandpumpkit
Would this work, or is there a better option?
Any help and advice greatly appreciated!

