Help with new 190 gal build

[coralor]

I am definitely going with the external bean animal, thanks. And the tank may even be as big as 210 gal - working out the details as we speak but getting closer every day!
So the inside overflow part will be approx 22" long (probably with a split return) with 5-6" on both either side for power heads. I currently have 2 Jebao's running on my 105g DT and am overall pretty happy with them. They're quieter than my MP40 was, at least, but what I'd like to eliminate is the introduction of the electrical currents inside the DT if possible.
My concern is also having enough flow for the SPS as they are the corals I will have the most of. (Currently the same
Suggestions?