thanks yes it is danio.Not Tetras. No adipose fin. I see the color similarities, but the mouth is wrong, as well. Also dorsal color is unlike Buenos Aires Tetras, looks more like a Giant Danio type. I would say they are a form of Devario malabaricus. Related to the Giant Danio, D. aequipinnatus. People used to think these were the same species, but they are not.