This certainly isn't a mainstream option, but I use a false bottom on my 22L in conjunction with opposing overflows and returns on the ends of the tank. A 30" x 11" sheet of Type 1 PVC sits on 2" columns which creates a "closed loop" type dynamic that allows for lateral flow to run a full circuit.
I've got two Reefbreeder 900gph Nautilus for returns, two Sicce 5000 XStream (opposing each other at the ends of the tank, under the false bottom), two Tunze 6045 (opposing each other at the ends of the tank, above the false bottom) and two Sicce Voyager Nanos opposing and above the false bottom). I've got the returns and the Sicce pumps dialed in on Apex so I can create massive lateral flow in one direction and then reverse that direction periodically. The Tunze's are in anti-synch mode and create turbulent flow as needed.
The tank is relatively new, but it is coming along nicely and the new sticks I dropped in a few weeks ago are showing great extension and putting on some size.
In short, I can dial up 3940 gph of lateral flow from east to west and then reverse the direction with 3940 gph going west to east. Realistically, I am pushing around 2000 gph at any given time in a 22 gallon tank.
I've got two Reefbreeder 900gph Nautilus for returns, two Sicce 5000 XStream (opposing each other at the ends of the tank, under the false bottom), two Tunze 6045 (opposing each other at the ends of the tank, above the false bottom) and two Sicce Voyager Nanos opposing and above the false bottom). I've got the returns and the Sicce pumps dialed in on Apex so I can create massive lateral flow in one direction and then reverse that direction periodically. The Tunze's are in anti-synch mode and create turbulent flow as needed.
The tank is relatively new, but it is coming along nicely and the new sticks I dropped in a few weeks ago are showing great extension and putting on some size.
In short, I can dial up 3940 gph of lateral flow from east to west and then reverse the direction with 3940 gph going west to east. Realistically, I am pushing around 2000 gph at any given time in a 22 gallon tank.