Cardinal Tetras Or Neon Tetras?

My second batch of Neons (10) is still going strong after 2 months and not a single loss (touch wood). School is at 11 with an addition from my first batch of 10.
 
There could have been another issue at play with my first batch as it occurred during my "week of carnage" while I was away. I still like them, but the knowledge lads at the LFS now say Cardinals are hardier (maybe the profit margin for them is higher too).
 

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