Originally Posted by BigJim
Your second baffle from the right should be raised up off the floor of the tank if you intend to use that 1" section as a bubble trap. I also think I'd make the last baffle 8" tall.
There are 3 baffles that will be 1" apart. First coming up 8" from the bottom, Second one 8" from the top leaving 4" of open space to the bottom and third one 8" from the bottom of the tank. The reason I was making the last baffle 4" was beacuse with the return area only being 4" that means water will evaporate very very quickly, So I figured if the last baffle was 4" high and then use egg crate or light diffuser then that will allow for more water evaporation. I got the design from Melevsreef.com
click and goto the bottom of the page where he updated the sump and you can see what I am looking at doing.