apologies for hijacking the thread
My issue is that i'm setting up a brackish tank with a land area for some crabs. The rfug will be my main biofiltration, but I'm working on secondary mech filtration. The water line will be 5-6" below the tank surface, so I don't want to use a HOB filter. My second thought was the canister, but I see your point, esp if its going to be used primarity for mech. I guess the next option is some sort of internal filter like the Fluval plus series, or an Eheim aquaball.