So I learned a big lesson today. I'm setting up my 93 cube and went to test the salinity. My refractometer said that the level was at .012. So I decided to add salt, of course mixed in water already, and let it circulate. Come back hours later and get a reading at .021. Soooo, I added more salt. Hours later I go to the LFS , because I don't have test kits yet, and they tell me that my salt level was....... .035. Come to find out my refractometer was WAAAAY off. Learned that I should be calibrating my instrument . Good thing I don't have anything in there yet and I learned this lesson without losing money besides what a few cups of salt cost.
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