09-14-2013, 11:37 AM
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Cloning tanks can be a bit tricky until you get a handle on it, takes a few times doing it. As jaysee stated, the filter will instantly cycle half the current bio load. This also means you took half the nitrifying bacteria from the established tank. Here's how you can deal with both the bacterial loss in the current tank, as well as the desired stocking on the new tank.
A mature colony of nitrifying bacteria is capable of doubling every 20 hours, I use 24 hours for ease of math. With the donor tank plan on some 50% water changes every other day for about a week, and feed lightly, same goes for the newly set up tank. Triple dose both tanks with Prime to deal with any ammo or nitrite issues, and carry on after the week of water fun. I'll get in hundreds of angels on a regular basis, taking a tank from 10 to 100 without a second thought. It just requires a really mature filter, a lot of water changes and Prime. As long as the bio filtration is well established it's pretty routine, just a matter of math & water.