50 Gallon Waterfall Lagooooon

[FishyFishy!]

So thanks to steve, I now have a good first skimmer sump, so the layout has changed. I am also adding a 50 gallon live rock sump on a new top shelf. The layout has changed to this:



I'm not sure where to but the DSB and cheato fuge though. Should I put it in the 20 gallon tank on the middle shelf (right) or in the main sump in the middle chamber? (see yellow arrows for locations)