Just have to match the power head to the right size gravel tube. If it sucks up gravel, go with a) bigger gravel tube or b) smaller power head.
Get a syphon going with your current gravel tube (assuming you have one) and measure the flow. Try to gauge how far up the tube the gravel was pulled and you can try to guess what size power head (flow rate) you might want. Of course, if it's too strong, just don't push the tube down into the gravel as far.