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Originally Posted by Seriak
The sand can still cause a spike.
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Just want to ask for my own curiousity what in the new sand could cause a spike?
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Each fish you add will cause a spike.
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Spikes occur when a lot of dead things start decomposing like dead stuff on uncured live rock. Now, if the liverock being transferred into a new tank comes from a tank with a heavy bioload, that rock already has more bacteria then necessary for the new tank. Even if the rock contains just the right balance of bacteria, would a few new small fish in 42 gallons cause a significant spike? I've never experienced a spike before (and I add stuff quite quickly) so that's why I'm asking.