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I am going to start my first brackish tank. I live in rural Amercia and could only find Doc Wellfish's Aquarium Salt. Evaporated sea salt is all the information on it. Will this work if not I can alway order online.
There are other minerals in marine salt that is needed for the brackish tanks that regular aquarium salt does not contain. Don't forget, brackish water is a mix of fresh and sea waters. Its the minerals in the seawater thats needed, not just salt. Theres some info on how to set up a brackish tank here: http://www.wetwebmedia.com/BrackishSubWebIndex/bracsyscomps.htm . Do follow the links at the top of the article for more info.
To measure the specific gravity, use a hydrometer; you can also order one from Bigalsonline.com.