06-12-2009, 11:22 AM
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Earlier posts are correct about Cycle [or Stress Zyme which is the same sort of biological matter], but remember it only works if there is a source of ammonia in the tank. The bacteria need ammonia to feed on in order to colonize the filter and tank surfaces, and if there is no continual source of ammonia the bacteria will not multiply and what is there will die off by starvation. Ammonia comes from fish introduced into the tank (if cycling with hardy fish) or fish food, or pure ammonia. But the source of ammonia must be maintained at the same level, i.e., if using fish food add the same amount every day for the 2+ weeks until the bacteria cycle is established. Your daily water test for ammonia and nitrite will tell you when the tank is cycled.
Personally, if you use Cycle, I would add a small fish. Fish are a continuous source of ammonia, and the Cycle does relieve the stress of new tank syndrome on the fish. You don't indicate the size of your new tank. The fish should be hardy, and only one (or maybe a couple if the tank is larger than 20g), and it should be a fish you want to keep. Using food fish or fish you don't want later is not advisable; it may introduce pathogens and disease into the tank, and then you've more trouble, when it could be avoided.