Wow sorry to hear! Young fish are always a gamble, as Long as your water doesn't have ammonia or nitrites and considerably low nitrates then it happens once in awhile.
One decent lfs In my area makes you bring a water sample for them to test upon returning a dead fish, if your params are crap, they tell you to get lost and they won't sell you anymore fish....
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http://www.monsterfishkeepers.com/forums/showthread.php?504763-Cheap-plants-less-nitrate!-POTHOS
*Go S. Vettel #1 rb8--3 MORE RACES LEFT! LET'S MAKE IT 5 BACK TO BACK WINS & 3 WDC!* :beer: