Hej Stig!
For the large tank I think Carlson surge devices will be impossible due to the volume. We can't room that large water containers anywhere above the water surface. And smaller ones won't give much effect. So I believe we will need stream pumps. If we can afford them..
!
Have you seen the reverse Carlson surge device? In theory it doesn't require the space above tank ,you don't have and also provide flow ,deep into the tank .