I have a fluval 405 on my tank. I run it empty with just the sponges in place. It is excellent for mechanical filtration. It can build up nitrates in the sponges so you should rinse them regularly.
Also, with canister filters. They are sealed with an O ring and when the water passes through, it is stripped of oxygen. Be sure that your water has plenty of aeration.
Means to make sure you have plently of circulation in your tank and ample allowances for gas exchange by the use of powerheads, open top, lots of surface space..etc.