Plumbing Triple Tank Set-up

[Cap'n]

OK, I have two 55gal tanks side-by-side and a sump underneath. The tanks are running independantly right now and the sump is not complete yet. I am planning on plumbing all three tanks in a series but I keep coming up against the problem of one of the overflows running dry because the other two tanks have slightly more flow. I really don't see how I can get all the outflow / inflow dialed in to match. Any easy solutions?

I'm almost at the point now to scrap this plan and simply have the two tanks share a common sump, but I think this will require adding even more equipment, and one of my main goals with this system is to minimize the amount of components.

Any input appreciated.