This practice of fish dying should never be. If you search the net there are many sites that are trying to stop this mad practice. Here in Toronto they tend to name them after sports teams and movies that are big and all kinds of stupid things. For example they have blue ones like you have there and they call them Blue Jay Tetras (after Toronto's Baseball team). Then they have these pinky-purple ones called Raptor Tetras (after Torontos Basketball team) Then the most recent ones I have seen are called Hulk Tetras and yup you got it, they are green and came out right when the newest Hulk movie was released. You would be shocked to find out what fish are dyed.

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55g planted tank CO2 system, Eheim 2217 and internal Fluval 4, pinpoint ph monitor,30g Newt and Toad tank and a 2g Nano