yea I have a fluval 406 Canister filter. However I just ordered a 30 G sump and a large protein Skimmer (Rated for 200G). Not using a RODI but not using tap water either.
I have a Snowflake EEL, 2 Spinybox Puffers, Raccoon Butterfly and 2 Clown Fish in a 72G Bowfront. I feed them once a day...