Want a change in flow!

[DaprDon]

I have a 20 gal AIO. Thinking about changing from a flare return nozzle to a double Random flow locline kit. What would be the highest gph return pump I could use? I want to eliminate the powered in my tank. Mostly LPS in the tank.
Sorry, not a good pic.

 

[ryanjohn1]

What may be your deciding factor on return pump is how quickly water can get threw your chambers of the aio