I was thinking about running an inline pump. Im leaning now towards a 50 wide. I like the dimensions on it, and I can hold a few more fish,as well as a great rock set up. The tank is a ridiculous price, and I can find it anywhere. theres a HUGE difference in price between the 50 wide glass and a 65 or 70. The 50 is 130reef ready and the 70 is a little over $400. 20 gallons makes a big difference evidently. Im in it for the extra 6 inches back more than anything. Are the external pumps a pretty good investment?