Bidirectional tidal flow

[MitchM]

lol...I had a check valve.......once....

I was wondering if the pressure coming back would somehow move the position of the unit.

I haven't located my sump yet, so there is the option of mounting it pretty close to tank level. 40 gallons or so of drain back wouldn't be a problem.

You don't have any existing units that you have pictures of do you?
On your website I see the Revolutions in action, but they are mounted in the tank.