07-20-2012, 06:04 PM
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You have a wide range of salinity to choose from, or else I'd ditch the Hydrometer. But the range your looking at is 1.017-1.027. So even the Hydrometer should get you there.
Out of the fish you've chosen, only the Longspine Cardinal and the Orangelined Cardinal fish would be anywhere suited for your tank.
As for the test kit, you'll just need to test for Ammonia, Nitrites, Nitrates and PH. Unless you want Coralline Algae growing, then you'll need to test for Alkalinity, Magnesium and watch your Calcium levels.