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the tank is a 20 gallon that is mostly empty. all it has at the moment is 8 neon tetras, which can live in brackish from what i've heard, 10 cherry shrimp, and some dhg
What specific gravity do you keep it at? Depending on the source, a specific gravity between 1.005-1.010 is considered brackish.
I've been googling neon tetras and brackish water and cannot find one instance that says that this is a good combination. Considering where they are from, that makes sense along with the fact that they are sensitive fish.
the tank is purely freshwater, but i was considering turning it into a brackish tank because i love crabs, and the only one that would seem to fit perfectly is a fiddler, but i suppose that won/t be happening