I use these underrated old boys. My first one of them is 6 years old now and hasn't had even the o-ring changed yet, still running.
https://www.allpondsolutions.co.uk/aquarium/filters/external/2000lh-efx/
Specs:
Suitable for Tanks up to 1000 Litres
Flow Rate: 2000 Litres per Hour
Hose size: 25mm / 1" Outside, 18mm / 0.7" Inside Diameter
Hose length 1.8 Metres
Water Volume: 20 Litres (Approx)
Media baskets x 4
Height Max: 2 Metres
Power: 55w
Dimensions: 290 x 290 x 490mm / 11.4" x 11.4" x 19.3"
FX6s have 924G/H flow rate pump. 5 of them are 4620G/H. To match your pump one needs 4 of them. FXs are not known to leak and from all the equipment I've ever used filters are the most reliable. I changed 2 leaking tanks over the last few years and my old filters are still running. FXs do not hold that much media though. They're mostly about the flow.