No film on my tank or equipment but I did notice some snow when I was manually dosing. Typically I have a BRS doser doing the work and would never notice any precipitation as slow as it drips. The snow could point again to low Magnesium but not sure why the numbers don't align to that when tested by two different kits. So odd. If raising it to 1450 doesn't work then I guess I will try the other direction.