After mixing a fresh batch of saltwater, I measure the salinity and it's at 1.026 - with a powerhead still on, I leave it over night, and the next afternoon, the salinity dropped to 1.024! I'd think it would be the other way around, but not in my case. I used the same instrument to measure the salinity, and also I tend to verify again with a floating hydrometer, and the reading holds true.
Is it normal for salinity to drop?
Is it normal for salinity to drop?