Looking for some advice on a return pump. I'm currently running a rio 2100 or so which is doing the job sort of, but I would like an external with enough flow to help out with the circulation a bit. I have a typical 75g RR with the overflow in the left corner. Right now the return fixture has a single head output but I'm going to throw a dual headed one on there so I can hopefully use one head to hit a deadspot behind some rock and have the other one to help move the water surface around.. Any advice is much appreciated.