ok, my sister in law has a few tetras that i can't figure out what they are. they look exactly like my black skirt tetras but they have long flowy fins and tails that remind me of a beta. they are beautiful and i would love to get some for my tank but i don't know what they are. she's had them a while and can't remember what they are either, just that they're in the tetra family. any suggestions?
