After going through many sump threads on here this is what i have come up with for a 29gallon long sump for a 75gallon tank.....I'd just like some feedback as I plan on getting the glass today or tomorrow so I can get rolling on this. The picture is not drawn to scale but I'm pretty sure the glass will be, from left to right...4" tall, 10" tall seated 1.5" above bottom, and 11.5" tall. As for the size of the divisions, where the water is brought in I think that will be 4" where the media is will be 20", to the left of the media will be 2" and where the pump is will be 10"..This is for a FW tank with a pretty big bio load..if I left out anything let me know and I will try to fill you in, haha. If it's of any importance the size of the aquarium is 36"x12"x16"