2 cups per 5 gallons is probably your best bet and depending one your salt you should get a gravity of around .024, .025 area.
Your best bet though would be to go out at buy a cheap hydrometer from the store for 15 bucks.
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System: 30 gal, various soft and LPS coral. 3 powerheads, 96 watt light, backpack skimmer and a 1/13 HP cooler, running overtime. 1 anorexic Fuzzy Lionfish.
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