You know, I saw one of the Gen 2 Ecotech MP20 and MP40 powerheads today at Aquatek, and I've gotta say, I was actually unimpressed as to the size... Supposedly they take up less space than a traditional powerhead 'cause the motor is outside the tank, but man, that part of the powerhead that's inside the tank is about the same size as a smaller Koralia or a Tunze Nanostream...