Chris 2500DK, I think the question I was trying to answer is, when you take the filter off the established tank...how long should it have been ON the established tank. Like you would not want to change all the filter media on the established tank today, and move it to the new tank tomorrow.
TheeMon, my two weeks is from reading all posts on this forum since I joined. Usually the "facts" that stick with me are from a mod or a very experienced poster, and I've seen this more than once, but can't cite the actual post. If you think about how long it takes the bacteria to grow during a cycle...
1-from the time when you first start getting nitrite (which means a few bacteria have latched onto the filter and are eating ammonia and creating nitrite waste)
2-to the time when the ammonia goes to zero (which means enough bacteria have grown to eat all the ammonia produced by the fish)
Thats about a week (I still have the daily log of readings from the cycle on my first tank).
If you allow a couple of days at the beginning for the bacteria to find and latch onto the filter, and a couple of days at the end to be safe...two weeks just makes sense...to me anyway, LOL.
I've never tried something shorter, and I've cycled all my tanks from the original using the two week timeframe. But the two weeks is not something I've proven is the minimum by trying shorter periods until failure occurs, or examining the filter with a microscope. So, given my signature, I should have said "IME, two weeks." :thumb: