I have two tanks, one 36 gallon Bowfront and one JBJ 20 Gallon Rimless Frag Tank. These are the filters I have for both.
36 Gallon:
Fluval Canister
Protein Skimmer
20 Gallon:
Overflow into refugium containing live rock and ceramic plugs
36 Gallon:
Fluval Canister
Protein Skimmer
20 Gallon:
Overflow into refugium containing live rock and ceramic plugs