I currently have an nj 3000 return pump on my 130 gallon, 2 fluval 406's and a koralia magnum 7. I have a nj 4500 pump that i want to hook up and i also wanted to get another magnum 7 so i can link them together and alternate them, so after all the pumps are running there will be roughly 7,500 gph of water movement in my reef tank, i am running 2 hang on back overflow boxes and im worried that that is to much flow for the overflows to handle, is this too much flow? Or will the overflows be able to handle that?