The VorTech pumps are upgradeable. If you have the MP40 (sold from Spring 2006 until Fall 2007) you can upgrade to the MP40wES. If you have the MP20, you can upgrade to the MP40wES by buying the MP20 to MP40w Upgrade Kit (P/N: MP153), which includes the Wireless Wave Driver and a more powerful power supply to get the higher flow that the MP40w offers.
At EcoTech Marine, we know as hobbyists ourselves that we often start with a small tank and move up as our passion for reef aquaria grows deeper. Our upgradeable product line allow you to have the option to change between the different models without having to buy a whole new model.