Why my salinity decreases ... ?

Maybe salt Creep ???? Maybe water changes with lower salinity water ??? what are you using to messure the salinity ????

I just switched to a refractameter and i noticed the hydrometer was about .002 lower than the refractameter.
 
Like Civic said, salt creep, skimmer, being lax in the new water for water changes.
There's several things that will slowly lower the salinity.
 
do u have a drain line on your skimmer collection cup? if u skim too wet it could be pulling out too much saltwater and when u add top off water it will lower your salinity.
 
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