yah thats the gph for the FX5. What Im really curious about is how the water flows within the FX5 canister. Cause there are 3 round baskets the outter of the baskets is covered with mechanical sponge and then the center holds the media. So how does the water flow? does the water flow through the perimeterof the canister and then pass through the sponge through media then out into the tank again? Im not sure cause when i looked into the canister it doesn't seem like it would flow that way cause the intake and outtake tube both opens up in the bottom of the cannister. So it seems like the water just touches the bottom of the cannister and then out again back into the tank.