Two days ago, I rinsed 150 pounds of SD sand, put it in my new 75, and turned the pump on. The pump immediately stirred up the sand surface and made the water cloudy, but I expected this to go away in a day or two as I experienced with my previous tank. The cloudiness has not diminished at all and the overflow, tank, and sump surfaces are covered with a whitish film. Has anyone had a similar experience? Any suggestions as to cause or remedy? Thanks.