02-20-2011, 12:18 PM
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Any fish tank needs time to cycle; the bacteria must appear, colonize and then multiply by binary division if there is "food" (ammonia, then nitrite) for them. The time it takes for this to occur varies from 2 to 8 weeks normally, and is dependent upon many factors.
Seeding a new tank with live bacteria helps "jump-start" the cycle, but cannot "cycle" it, per say. It merely gets the bacteria working faster. So, very few fish at first as the previous response mentioned is wise. Of course, the more seeding you do, the more fish it can handle, but to be safe I would only put in maybe 2 guppies, wait a day (minimum), then a couple more, etc.
Live plants also quicken the cycling, and the more the faster. Plants grab ammonia/ammonium very fast.