[maartenvr]

I am planning to move my sump tank into the basement, and pipe through the wall.
I have a 90 gallon tank. And the sump will be about 12 feet below the display tank.

What size pump would I need?

 

[tony1928]

Depends on your sump setup and how much flow you think you will need. There's a lot of head loss to account for too. I think most guys doing what you are planning use external in line pumps.

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[smccleme]

I've got a return pump that I believe can handle 22 feet of head pressure if you need one.