I run the two MP40W ES on my 77 in the EcoSmart Tidal Swell Mode (TSM) at just under max power. Occasionally I'll also switch them to the EcoSmart Nutrient Transport Mode. I upgraded the drivers to EcoSmart models some time ago and figure since I paid for the drivers with the new EcoSmart modes, why not use them? The EcoSmart modes provide the most benefit when you have 3 pumps in Master/Slave configuration, one on each end and one on the back glass. On your 90 gallon, two MP40s with the MP10 on the back glass would be ideal, then you could definitely lose the Koralia. With an MP40 & an MP10, you'll probably need to keep the Koralia going on a tank your size with SPS corals, depending on your aquascaping I suppose.
The MP20 to MP40 upgrade includes a larger power supply in addition to the new driver. This provides the added power to drive the MP40 to the significantly higher max flow rate over an MP20.
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