In all honesty I would just use two hobs instead of hob plus cannister. Cannisters are such a PITA to clean vs a hob. So in the long run, will cause you to do the cleaning less and less often due to the long difficult process of cleaning. Plus the risk of breaking something during the cleaning and putting the can out of action till you get spare parts. Where as cleaning a hob takes 15 minutes at most and normally there is no risk of parts breakage during the process.
I have had 6ft 125gal tank with three hobs and they did just fine even with a 12in cichlid.