I use two Marco UP2/E pumps in parallel to have an installed spare. I have never seen us draw enough water to run both pumps together. They do run at a slightly lower set pressure than all the bigger Marco gear pumps.
They supply all the water we need. A UP3/E would, in my opinion, be a fine pump for a Super Maramu. A 12 gallon per minute pump seems like almost ridiculous overkill to me...even with a 20% discount off list price. But then, I don’t power wash my decks from my tanks...
And, none of them are mag drive pumps. All direct drive with lip seal on the shaft.
I have no doubt that a UP12/E works, but how much water do you really use in a minute? Is it worth paying that much for a pump who's capacity is WAY more than you’ll ever use? That’s more water than the bilge pump can pump out of the sump!
I do come from the perspective of generally being very frugal with water from the tank, so other people might have a different outlook.
Annapolis, MD, USA