Join Date: May 2009
Location: Clear Spring, Maryland, USA
3 inches in from the end and covering the whole end should be enough filtration if you want to do it that way, IMO. That's at least the equivalent in volume of a canister, or more. My Rena XP3's have about 2 gallons of volume. You're talking closer to 3, which should be plenty....FYI, a gallon is about 230 cubic inches in volume, if that helps. Make sure that you can get the media out easily for regular cleaning..........or you can go with the sump if you want everything hidden under the tank.