yeah well i mean, you can do it that way. i only made a bubble trap for the return pump side of mine. there really no use for two bubble traps, and it just consumes space. on the drain side i did one wall of glass but with a sepration about 2' up, about 1a' apart, why? because i wanted the water to be able to move thru the refugium side diagonally, rather than the water just flowing on top of the refuge, it is forced to move thru the cheato and rock. why the 2" picec for the lower half of the wall? because if i just left a gap between the baffle and the floor, then if i tried to put sand in the refuge, it would just cause the sand to blow everywhere. hope this helps! check out my thread if you get home and can view the pics