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I have a 20 gallon long with 1 betta, 1 bumble goby, nad 8 neons along with snails. I heard that bumble gobys live longer in brackish water? Being that I have a community tank is it possible to not have an "all out brackish" tank? I was planning on adding little by little but only reaching, lets say 30% of the "brackish capacity" or something like that?