Yes, awesome drawing I know. So when I bought the tank it came with this sump. 48"x12"x18". The way it's piped now is the 2 overflows combine and then split into 3 pipes that empty into the 3 boxes of the sump. Before he was using Bioballs that were held up using a plastic mesh with nothing in the last compartment. The bottom of the sump is continuous the entire length with the separating walls sitting about 6" off the bottom. I'd like to add a refugium and possibly some more live rock. I just ordered a magdrive and will be replumbing it. Any suggestions or ideas? I'm thinking using the first box as the sole entry point with one or two filter socks but not sure how to utilize the other boxes with bottom being continuous. What do you guys think?