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Yeah this is the same fish as in my LFS, It was in freshwater section. I read the link you posted and seems they can adapt to freshwater.
"Fan Dancer Gobies are brackish water fish. They can gradually adapt to living in either freshwater or saltwater but do best in water with 1 Tablespoon of aquarium salt per each 5 gallons of aquarium water."
Probably my LFS had already adapted ones .... Thanks for the reply...
I wonder if the lfs has turned the tank into brackish and just didn't label it. At the lfs here, there were 3 tanks that were freshwater, then one day the fish were moved and there were puffers in there, and hadn't changed the print on the tank yet, said freshwater. A couple days later I went back, and they changed it. Or it could have been acclimated for freshwater before the lfs got it and it's in freshwater. Anyways, nice looking fish.
My LFS has brackish tank in other section, but next time when i go to LFS i will ask them if the tank containing gobies is freshwater or brackish water.