I was doing maintenance on my tank and I got to thinking about my pump. I use a coralife 1270 external pump to feed the water back to my 180 tank through 2 returns on either side of the tank. I have the return on a ball valve that is turned about half way to restrict the water flow. The reason I do this is because if I run it full power the water level in my sump drops really low and the noise increases. I was thinking why not change the pump to something like a Iwaki WMD20RLXT that would have a return rate of 382 GPH according to the calculator. That return rate would create an overturn rate of twice per hour. I figure that the smaller pump would equal less energy use, lower sound, and less heat. The only downside I could see is that the flow in the tank would be cut by half. I never really got much flow from the returns anyway and I use a modded maxijet now for flow with much better results. If I did this I would like to add a second maxi or koralia. What do you guys think?