Whenever you test for salinity, do it two or three times in a row to make sure the refractometer is reading accurately. The first measurement may be off because the glass is cold, for example. If you are tossing out more skimmate than usual, salinity will drop as top off water replenishes the system in greater volume.
Knowing the size of tank would help give us some scale. It's much easier to drop your salinity quickly on a smaller tank than a large one. How much top-off are you going through in a day? Are you wet skimming? If so, how often must you empty your skimmer cup?
what size tank do you have? remember that small systems can have huge swings really easily.
The only other way that is popping into my head at the moment is wet skimming. this can take lots of salt water with it and the top off is replacing it so it drifts downward.
Yes, same temp and salinity between the two. Sorry I should have said that. No creep, leaks or spills. Yes on the refractometer, and we even calibrated it
You can loose salt in any number of reasons. Primary ways to loose salt are through salt creep, leeks, and spills. I am assuming that you are measuring salinity with a refractometer and temperature is the same between tank and new salt mix? Contrary to popular belief some salt is lost through evaporation.
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