I am still having trouble with my hydrometers (I have two different kinds). I know some of you advocate refractometers instead, but it's not quite in my budget right now. What I don't understand is, how come when I do a water change and add salty (Instant Ocean) water to my tank and then measure it with the hydrometers, the things seem to say it's freshwater? But if I come back the next day and measure again, I'll get a reading of a higher SG! Does the salt need time to disperse or something? My tank has great water circulation and only less than 10 gallons of water in it. Despite these problems with measuring every time I change the water, my mudskippers and mollies are doing great. So I must be doing something right. I just worry about the lack of precision with which I add the salt-- honestly, I eyeball it.
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