I have a 20g tall and a 60g. The 20g has approx. 1000 gph running through it.
The 60g has over 3000 gph and I still need more.

Your corals will be mad at you for a few days...then they will love you for it...
My suggestion would be 4 Koralia 4's. 2 at each end.

Just a thought.