I think there would still be die off when you add live sand to a new system. That is why people say you can just add live sand to a new system to get the cycling started because there would be enough die off from the critters in the sand to start the bacteria process. Also, everytime you add a fish, you now no longer have enough bacteria to cope with the extra fish so a spike will occur again. By adding a lot of fish at the same time your spike will be more pronounced. The higher the spike, the greater the chance for stress and dead fish.
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