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I have never treated a firefish with hyposalinity, but I have no reason to believe they can't tolerate it.
Swing arm hydrometers tend to be both inaccurate (i.e. not indicating the correct specific gravity) and inconsistent (i.e. not reading the same value each time). You should not use a swing arm hydrometer for hyposalinity measurements.
A refectometer is a very worthwhile investment. For less than US$100, you get an accurate device that can be used for your main tank as well as for hyposalinity in a treatment tank. The other great thing about refractometers is they need very little water for a reading - only one or two drops. This makes it very easy to test shipping water for accessing acclimation times.
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ATJ
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