I finished filling the tank and started the filter last Friday night. I used all RO water and IO salt. It was kinda cloudy because some of the water sat in the tank uncirculated with the Southdown for about 5 days before it ws full enough to run the pump. At lunch today, around one oclock all was normal but I just checked it and the sump and the heaters are all completely covered with a white film. The salinity is right at .025 still. What have I got going on here now? Is this a concern? Thanks for the advice.