i baught 4 tetras from my local LFS.. i dont know whatthey are, i tried to take a pic but the buggers wont swin to this end of the tank

and my cable on my cam is short
all i really want is a species ID
there tetras and are more slimline than Cardinals, and have all clear body with a hint of UV blue at the tip of there tail. the Anal fin is more like a blackwidow tetra, kite like but the fish still apperes to be streamlines like a cardinal. they also have what looks like a dark stripe from the begining of the anal fin to the tail. but i dont think this is a distunguishing mark as its not really a think colour more the insides of the fish making the dark.
i just wanna know what they are. ive named them glass tetras for the mo
thanks
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55US Gallon Medium Planted | 36x15x24Tall
PH 7.0 - 7.2 GH 11
Ehiem 2232 Thermo
2.7WPG 160W 10,000k 5xNO T8's
Sand+Eco Clay, CSM+B Baby Steps + Pres.Co2