Looking for powerhead suggestions. My tank is 48 inches long. I have the return at the right end, moving 600 gph. A Nero 3 is at the left end, can move up to 2000 gph. The Nero 3 kind of blasts the first 24 inches or so and then tapers off. So, am wondering about adding a second powerhead but am thinking a different type just to provide a different action. I want an economical one and do not need app control. I am having a problem with film algae and wonder if better water movement will help limit its growth.