I don't know HOW everyone else here has been measuring or what they are measuring with... BUT I use Instant Ocean salt and and Instant Ocean Hydrometer and I do EXACT 5gal water changes too... Acording to my Hydrometer.... EXACTLY 1 and 7/8ths of a cup will give you a 1.021 spec grav... In my experience.
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45 gal fowlr,
fluidized bed, UV ster, Rimora skimmer
25lbs Fiji / African LR
1 percula clown
1 diadema dottyback
1 6 line wrasse
1 juvenile picasso trigger
1 Coral Beauty
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