New Tank Plumbing Schematic

[Lofus]

So it looks like all the 'filtered' water will be going to the fuge and the main tank and all the "dirty" water will go through your prop tank first. From a water quality point of view would you not want all the "dirty" water flowing to the sump first and then the clean water to the fuge, prop and main tank?

Where are you putting you skimmer?

It also looks like your prop tank will empty into the sump in the even of a power outage. you should make sure the sump has room for all the water from the main tank overflows, piping to the prop tank, prop tank outlet chamber, and piping to the sump. This will be in addition to the return lines to the main tank, fuge, and fuge to main tank.