I've never had a canister filter so take my advice for what it's worth...
I've read a lot about canisters becoming nitrate factories if they aren't meticulously cleaned.
I've also read about quite a few aquarists who recommend removing the filtering material and just using the canister to push water.
As for my nanos, some of them get all the filtration they need from
LS and
LR alone.
I've also tried various form of
HOB filters and in-tank and
HOB fuges.
(Marineland
HOB filters have the absolute worst track record with me.)
The best thing I've tried so far is taking an Aquaclear 110, removing all the filter media, and turning it into a type of
HOB fuge with
LR and Cheato.
That tank just about runs on autopilot.
Well that's my limited knowledge and opinion. Hope it helps.