drain help

Hi All, Im planing to add a frag tank next to the sump in the basemant. The issue Im having is thet the sump is already on the table. And I cant make the frag too much higher. As you can see on the picture the frag would be 20"tall and sitting about 6"above the sump bottom. The sump is 17"tall...

I am in the process of setting up a new 125g display tank with a three drain Herbie overflow from Modular Marine. I have my primary drain flowing to my fleece roller and the emergency drain dropping directly into my pump chamber with and air gap so I will hear audible splashing and see bubbles...