Under Gravel Filter??? That's almost a definite no-no... canister also not very useful.. best if you can get a proper sump...
I also agree that the 2011 is too small for this kind of stocking... and why would your 2011 need an air pump?
Bro.. but first of all, STOP LISTENING TO THE LFS WHOM YOU HAVE BEEN BUYING THESE THINGS... they most likely have already chopped you many times over...