[GuyBFF]

The Big Mamma is a heater core with new fittings installed. Heater cores are usually 1/2" or larger, so if its not then you can probably just solder some bigger barbs in anyways. As for pumps, commonly people want about 250gph with DD Maze 2. The eheim's are rated at 80,160,320 and 640. I'd probably go for the 320 as from what I hear the actual flow in a system is less than a comparable mag-drive. The 320 is model 1250, and sells for about 65.00 at Danger Den or a fish store.