Originally Posted by mike31154

If you can afford the 'ES', go for that. Check out the EcoTech web page, they have all the manuals for the various models available for download as pdf documents. That will give you a better idea of the differences between the normal W pumps and the W ES models. With the ES models you can have a 40 at each end of the tank and a 10 at the back in the center. I believe this is a recommended configuration for your size system and will take full advantage of the latest EcoSmart Tidal Swell and Nutrient Transport modes.