need sump ideas for 180 gallon reef

[scott180reef]

i have a 180 gallon reef ready aquarium, That has been running for about 7 months. I had two 90 gallon reefs before and just put both of them in the 180. I'm not happy with the sump now, so I'm going to build a new sump out of a 125 gallon all-glass tank. I have two Euro-reef rs-250 skimmers, that i'm going to use. anybody got any ideas about the design of the sump. please give me some ideas. I also have 45lbs of live rock rubble and about 5lbs of macro algae to put in the sump.

thanks
Scott180reef