Getting a new 340L tank( got a 100L) was going to use a canister filter but the one I like comes in a hardwood cabinet with a 120L sump included. Not sure what filter mediums to use and in what order to get best results . Canister filters seem to have 4 or more stages . Also heard about actively growing algae in it to help with nitrates as present in my tap water. On a water meter so my own ro producer not really an option.