Okay please remove this sticky as the initial cycling information is so wrong it should be banned and made illegal. You NEVER cycle a tank without fish for ANY REASONS. Heres why:
1st : When your cycling a tank you are actually cycling your filter. Seeing as there is 0 ammonia in any water your going to use you'll never cycle the filter as the bacteria colony needed for the bio system needs ammonia to even begin.
Not entirely true...you are cycling the entire tank. The bacteria are going to live on all surfaces that have adequate food and oxygen. Provided you have sufficeint tank circulation that will be most any area that touches the water, not just the filter. I think many folks have problems with filter media changes and crashes because their tank does not have sufficeint circulation. Too many dead spots limiting adequate dispersion of oxygen and food source. A good filter, with propercirculation is going to distribute the nitates and nitrites to all areas of the tank.
2nd : Leaving the tank up for a week or 2 does nothing to create a bacteria colony in a system that has no ammonia from wastes and so completes the nitrogen cycle and then sits there doing nothing.
Ammonia does not have to come from waste. Rotting fish food, a rotting shrimp or a pure ammonia source is used. I never said to use a tank without an ammonia source.
3rd : The only way you can begin getting that filter cycled is to add fish and get some ammonia from there waste to get the system going. Not many to start in a 10 gal 2 or 3 is fine.
Refer to the above two answers.
These old myths about cycling need to be thrown away as the only possible way of getting a system going is with fish. Even after 2 weeks or more your filter will have colony whatsoever and the fish added will still go thru the same break in period. You need Ammonia from waste to get the bacteria needed.
Nope...ammonia from a bottle works fine.