I was curious as to why after reading the capacity of each skimmer. I plan on using the nac7 on my 120 so I knew the 9 was overkill for me. I did notice that Bubble Magus uses several different pumps - seems the "lower end" uses the Aquabee pump while the "upper" end uses Eheim. That would explain the wattage difference I guess. When do your Sols come in?