I've heard of Blue Columbian tetras before and Blue Tetras, and have even seen them, but have never heard/seen anything called a Blue Flame tetra.
Blue Columbian Tetras are a round tetra that are an opaque shimmery red/silver/blue with yellow and red on their fins. They have the tall, flag-like dorsal fins, and can get pretty large. They're pretty hardy and look great as a fish to offset red serpaes or silvery purple diamonds.
Blue tetras are elongated in shape and are more of a blush blue color on a white background. They kinda remsemble blue bloodfin tetras, but blue tetras have no red fins. From my experiences these blue tetras are as delicate as penquine tetras, sometimes they're good, sometimes they're not, and they always go belly up without a reason.
The only flame tetra I am familiar with are the red Von Rios.
If you could post a picture, that might help. None of my books here have anything on blue tetras at all.
~~Colesea