Help on water height going over, overflow.

[Chad]

Well, I am doing the Herbie style overflow, just a single gate valve on the overflow end to adjust the water height so it is even with the flow from the return pump. I have spec'd the return pump to so it has a max of 200gph after factoring in head pressure. The tank is only a 34gal cube, I think 200gph should be plenty to service this size of tank. All the other flow will be from the closed loop I am putting in.