MeVsTheWorld
Salt Creep
Good start. Looks like you have plenty of space under the tank. Instead of the 10g you could use a 15g high(same footprint as the 10g). You'd be able to get a little more water volume out of the same space
I have the eshopps pf-800 overflow with a gurgle buster and use a Rio 12HF for a return. I have the return line T'd off with a ball valve, so the extra flow just goes back into the sump. This setup is very quiet as it sits in living room. I use one MP40 for flow. Good luck with the build.