Wow I actually don't remember this post. I have learned a lot since then. I decided to have a professional build my sump for me. very happy with the result. Much more money but I know I got it done right for sure.I am going to do pretty much the exact same design. With a turboflotor multi skimmer and mag 7 return pump inside a 20g long tank. I was looking at home depot a sheet of acrylic is like $35.00 I am going to look around some more. My question is the height of the baffles I guess it can vary with different skimmers. The turboflotor multi I beleive as long as the pump is submerged in water its ok. An average 20g long tank is about 12" heigh I believe. Should the first 3 baffles be about 10" or so or is that too high? The last of the 3 baffles should have 1/2 teeth cut on the top to prevent snails from traveling? and then the last baffle before the return pump should be about 4" or so with eggcrate siliconed to the top of that so if the overflow stops for some reason all of the water does not pump from the refugium section and helps to prevent sand and stuff from entering the return pump zone. If any of this is incorrect I would love for someone to let me know so that I don't screw it up when I actually do it.