08-24-2011, 11:30 AM
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Nope - even with bio-seed (and water does not help), a tank will need 3 to 6 weeks in order to achieve a stable N2 cycle and 3 - 6 months before it's established.
If you have an established tank, add a sack of gravel, add if possible some floating plants and wait at least 3-6 weeks before adding any more fish. Test the water and/or get an ammonia monitor and/or watch for signs of stress in your fish that may likely signal an ammonia spike. If this happens, do a 50% water change.