Brackish

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I think it's 1.005-1.021, depending on the type of fish. A hydrometer or refractometer should be able to measure those levels.
 
Anything between freshwater and marine water is considered brackish. Different brackish fish require different brackish water level. Dragonfish would be moderate-brackish. Depending on the type of puffer you own, they would either require high-end brackish or low-end brackish.
 
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