Can you help me I'd this fish, I have just got it but forgot the name it was red tailed c____ that's all I can remember, he said it was a relative of tetras, it has a red tail, it's body has a blue sheen on silver and has a black spot above the pectoral behind the gills and it has teeth, the pictures arn't very good buti don't want to spook him with the light so I can get better ones later if needed.