05-14-2012, 12:34 PM
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As said by others, it helps in the cycle process, but doesn't eliminate it. Adding an established filter to a new tank can serve to quicken and reduce the cycle, but will not eliminate the cycle process. Nothing will.
For new tanks, I also always add an established filter. I also add some bacterial supplements as well as conditioned water (at different time, naturally). I still wait at least a few weeks before adding the first fish.
Adding fish is part of the cycle. It's needed. As others have said, add fish slowly. Let the tank acclimate to their bio load. It will result in healthy fish and a cleaner tank.
You can't avoid cycling a new tank. There is not magic trick to it. You can reduce the cycle time and quicken the cycle, but you can avoid it.