Gary,
Well I'm going 24" up and 28" across, then 10" down. The water level will be at the baffle on the left. The overflow is a 2" opening into a 1" pvc (gravity-fed) . I'm thinking that the Eheim 1040 will do the trick. What do you think? I put a small baffle (on the right) for the pump input to keep from stirring-up the sandbed. Thanks for any input.

Steve