His tank is definitely cycled (he had a fishless cycling thread). Have you been doing really big water changes or do you have a ton of plants Jimmy? It is curious to have 0 no3, but I know personally it's cycled.
What is the temp at? As long as the heater is sufficient, there shouldn't be any concern whether the water is hard, soft or in between.
How did you acclimate them? Did you try the drip method we mentioned?
I assume your remembered to dechlorinate the water during pwc's?
The other thing to remember is that initially stocking your tank is always the riskiest. You're going to be adding lots of fish at first (if it's fishless cycled), and you're bound to have a few bad apples.
Watch them really closely for any signs of illness like white specks, torn fins, rapid breathing, gasping at the surface, etc...