Good move, I guess depending on the size of the fuge. If it's a little HOB and you put a K2 in there, its too much, but anything under the lines about a flow rate of 30x, should be fine.
Having a powerhead in the fuge is really IMO the proper way to do it. Too people have mega flow rates through their flow and it never gets the chance to work effectively. You only need about 200gph through a fuge, depending on size, and the flow rate inside the fuge should be higher.