I totally went through that too. It was really a decision based on that I don't want any wires in my tank and would prefer to keep the least amount of electrical components in my water. It was hard when I ordered it, but after I set it up, I was convinced I made the right move and am now looking to buy the 2nd one. Have you looked at some of the youtube videos of large tanks with single mp40s? Those are what pushed me to buy the pump.