COMPLETE IDIOT UPDATE!!! When I bought this aquarium the return pump came with it. I was told it was a mag 9.5 so I've never really paid much attention to it. I swapped out the pumps and begin to clean the old pump to be used as a back up. When I looked at the label it was a Mag 12b! So comparing the two pumps I now completely believe the rating on the 6000. I made that statement with the belief I was comparing a 9.5 to the 6000. Instead I'm comparing it to Mag 12, big difference. Apologies:doh: