Frag tank plumbing.

[Reefrandybar94]

Okay so I currently have an all in one shallow lagoon. I want to add an all in one fragtank onto this system. My question is, is can I have the return pump from said display, pump water from the return section of my display to the locline of the frag tank and have the water go right into the display section of the frag tank. Then have the water of my frag tank go over the overflow through the chambers and back to the return chamber on the frag tank where the return pump will sit pushing the water from the frag tank back to locline on display section? The real question is will my water level adjust and sit properly?
Thanks in advance, see attached crappy drawing on an a&w napkin lol