I have one of those in my 55 gallon with plenum set up (makes the sand really high) and it initally caused sand storms really bad so I just kept rearranging my live rock until I found a set up that reduced flow in the tank, you don't want too much live rock in the way initally or it just deflects the flow, have little edges going up into the flow at first. You can also put in some fiberglass mesh stuff on the suctions to reduce the flow a little.