Ok I'm new here so please go easy on me
I've had my salt water reef aquarium up and running for about 6 months now and up until recently have been using a hydrometer. And I always added clean water whenever topping off the tank. But now that I've bought a refractometer with ATC, I've just noticed the following. I did a water chance about 4 days ago. I keep a normal specific gravity of 1.024. There is probably about 3/4 to 1 gallon evaporated as of now, and my refractometer still reads 1.024. If I top off with clean water, the salinity will drop. This doesnt make a lot of sense to me. I've checked the entire system for leaks and there are none. I've calibrated the refractometer with pinpoint salinity calibration fluid. Any ideas why my salinity seems uneffected as it evaporates?
