Depends on how the tank and powerhead is set up. I have a 20 long and powerhead but it is in a tall wood item to scatter the flow.
If flow is too strong, I add something to deflect or split the flow. Sometimes it is as simple as letting it shoot straight into the side of a big old sword. Other times I like to put it near the bottom, behind something and let the flow go up where it spreads out in several directions.