Questions about flow

Hi everyone. I have a couple of questions and I'm hoping someone with some expierience could help me out.

I am having a 260 gallon tank built. I am going for a natural look, so I don't want to see anything in the tank.(Powerheads, overflows, ect.) The tank will have an external overflow. I am hoping to raise softies and LPS.

I am concerend about the flow on this system. It will have two litle giant pumps providing 750 gph each to the four locline returns coming into the tank from the eurobracing.

Should I have some sort of closed loop system set up on this tank? Or something else to increase the flow? Bigger pumps?

How can I provide better flow, and still keep the equiptment invisible?

Thanks for any help!